Heinz Doofenshmirtz sometimes tells backstories about his childhood or recent events that have happened earlier to Perry. They reveal the events that motivated him to pursue a scheme or build an Inator, and thus become an evil scientist.Gimmelshtump, and when they came across lean times, their beloved lawn gnome was repossessed. Since it was necessary to protect the zatzenfruit garden against "witches, spells and wood trolls", his father dressed Heinz up as a gnome and forced him to stand watch for hours at a time during the day and night. Any time Heinz tried to move, such as when friends came by to play "Kick the Schtumpel", to eat Doonkleberries or to wave at his neighbor Kenny, his father was right there, yelling at him "Bewegen Sie nicht!"("Don't move!") .
Later, in "This Is Your Backstory", this was slightly revised that after ten seconds, the cake was repossessed after Heinz found out that there was a two-person minimum.
Doof tried to tell a back story, but his head was hurting so much that he couldn't tell it.Goozim With a Stick". The puppy was named "Only Son", because it was like the son that Heinz's father never had. Only Son became a famous dog, which brought fame and fortune to the Doofenshmirtz family. After this, Heinz was still forced to be the lawn gnome. Boris would always kick sand into his face. Everywhere he went, sand was kicked into his face. Due to these events, he became paranoid and felt that sand would be kicked at him at any time. Except at the beach when he was expecting it, but didn't. Even when that happened, he was still scared of it. Hans. His puppetry wasn't very good, but that didn't stop him from taking away the girl that Heinz was trying to win over. He never did a shadow puppet again.
Later in "This Is Your Backstory", Heinz said that the volcano's poetry lacked substext.days as a bratwurst street vendor, which he described as being less evil than his current occupation. Despite the fact that bratwursts had "superior workmanship, finer meats and exotic spices", street vendors that sold hot dogs did much better than bratwurst vendors. At the present time, almost no one (other than Heinz himself) remembers that street vendors once sold bratwursts. Heinz attributes this to hot dog vendors "having it all": chrome-plated carts, endorsement deals and fancy blimps.
After two young boys walk by and make a joke about selling bratwursts being a telling sign that a person is lame, Heinz vowed that he would get revenge against the hot dog vendors, introducing his Hot Dog Vendor Revenge-inator in the process.Roger always out shone him.
In the introduction of his Mountain-Out-of-a-Molehill-Inator, Doof was told through his life not to do so multiple times.
In the book How to Take Over the Tri-State Area, Doofenshmirtz incorrectly states that he was the baby in question.
Fireside Girls (in this case, Katie and Gretchen) came to his apartment after hours to sell him cupcakes or raffle tickets, but he forgot to close the curtains to his window and they could see him still, thus causing the creation of his Invisabile-inator to make them all disappear. Balloony. When Heinz was dressed as the lawn gnome one night, Balloony floated away. Heinz tried to reach out to it, but Heinz's father shouted out to him to stand still. Heinz, upset, watched Balloony float away into the night sky.
Doofenshmirtz tells about how he buying a new home following the divorce from his ex-wife Charlene, and was shown a skyscraper that would become DE Inc. headquarters complete with a view of the ocean. The one problem was that the building was located near the Danville Lighthouse, with the boats blowing their foghorns all night long, and as a result Heinz was unable to get any sleep.
When Heinz was a child, his mother never let him swim in public pools.Milly and Katie from the Fireside Girls were at his door and tried to sell their cupcakes, and is weakened into doing this, so he makes a Metal Destructinator to turn metal into broccoli and destroy the bridge to their cupcake baking factory. Tri-State Area inside an invisible box. Linda Flynn-Fletcher at a drive-in theater to watch a movie. Linda says that she would like to be a pop star one day. Doofenshmirtz sarcastically replies that he will take over the world, and she suggests that he should start small and try to take over the Tri-State Area. Doofenshmirtz says it's unlikely but he'll try. He then brings out a machine to make the movie's sound fifth dimensional and attaches it to their car. Unfortunately, the machine makes the cinema screen explode and blast off into the sky.
Finishing the story, he is never welcome in Albania ever again, and had ended up in Italy and went to the Leaning Tower of Pisa, but they didn't make pizza there. Doofenshmirtz complains that it had pizza in the name, and since they were out of it, he didn't get any pizza.
Doofenshmirtz tells Perry, trapped in a pickle, that a few days ago, he went to Tony's Delicatessen to order a chicken soup but he argued with the owner over a fly (or is a raisin?) that he found in the soup- he even took the specimen to an etymologist.Master Drakkenblad's Pretzel Palace and that no matter how many times he tried to make a pretzel he always made a knot, thusly was kicked out and deemed unworthy and since then he hated pretzels.
An original backstory was told at the start of part two of this clip show. At age 16, Doofenshmirtz went to the store (spelled "Scthor") but was tricked into going onto a boat away from Drusselstein by his parents. He swabbed the deck to pass the time, and "was headed to a land of opportunity where golden opportunity awaited...but ended up in America instead" where upon departing, a giant crate was dropped on him.
In unveiling a replica of a Drusselsteinian car, Heinz explains that he had an uncle who had a similar ride that was brought out on cruising nights in Gimmelshtump along with other vehicles that were rebuilt from takeovers by outside forces.
Doofenshmirtz explains that he invented some technology that is currently being used in eye examinations, and is earning royalty payments from it; however, he is upset that something he invented is being used for good instead of evil. Because of this, he has invented the Eye Fog-inator, which temporary causes blurry vision for the people zapped with it. This will force them to visit the eye doctor, leading to further royalty payments for Doofenshmirtz, allowing him to use that money for evil.
Doofenshmirtz has a nightmare about the Kinderlumper and is inspired. The scientist plans to turn himself into a Kinderlumper, but Perry has never heard of the Kinderlumper. Doofenshmirtz explains the tale of the Kinderlumper by means of a song that Heinz Doofenshmirtz's mother used to sing to him: the Kinderlumper is a giant, nasty troll who takes misbehaving children and puts them in a gundersack. After telling the story, Doofenshmirtz enters his Kinderlumper costume, planning to turn himself into a Kinderlumper and scare his brother into giving up control of the Tri-State Area.
Doofenshmirtz tells Perry he couldn't finish his food at the buffet, explaining how that is a financial advantage for buffet restaurants. He states that he plans to open his own all-you-can-eat buffet Drusselsteinian restaurant, showing Perry his advertising and food. However, he explains that Drusselsteinian food is terrible, so anyone will eat only one plate and he'll gain profit. He also created the Eat-it-all-inator to eliminate the competition by shooting people with the ray, causing them to eat all the food in every all-you-can-eat buffet restaurant and run them out of business.
He shows Perry his newest invention, the Double Negative-inator, which takes any negative statement and turns it into a double negative. He made it because the Minty Wink Eggnog he wanted from Beverly's Lunch only is made in winter, so he made the -inator to zap Beverly so she can make it for him.
Doofenshmirtz plans to insult his brother Roger by using his 90-Degree-Turn-Inator to insult the visiting mayor of Stumblegimp by showing an old newsreel film of the events in Drusselsteinian history that led to a 50-year war between Gimmelshtump and Stumblegimp, which lasted until the Gimmelshtump mayor did the Dance of Contrition to end the war.
At Doofenshmirtz Evil Inc., Perry finds Doofenshmirtz cowering in fear outside the lab. He explains he's cowering because long ago, at a drive-in theater, he saw a scary movie called Night of the Felis. Just after the film ended, Doofenshmirtz decided to make an inator to make things larger. After using it on his cowboy hat and a mouse, he chose to use it on a retired stunt-bat from a bat circus, Derek, to make it easier. But he also remembered he also had a minor fear of bats. Norm shoots it with the inator making him huge so Doof is hiding from him with Norm outside the lair.
There was a girl who kept dumping water on Doofenshmirtz. He hated it so much. Everywhere they met, the girl would always dump water.
Doofenshmirtz-2's "evil" backstory is losing his toy train, causing him to become an evil dictator. He later finds his toy train after attempting to smash Phineas, Ferb and Agent P. Also, Doofenshmitz mentions some of his previous backstories.