Forum:Big Ideas

Can anyone think of new ideas that Phineas and Ferb haven't come up with yet along with something Doof might to do coincide with it? The first one I can think of is:

Phineas and Ferb humorously see a bunch of laziness everywhere and invent the world's biggest exercise machine. (Maybe the machine itself exercises as the people do)

Meanwhile, Doofenshmirtz finally decides to get Vanessa a car...by competing in one of those Keep Your Hand On the Car things and his new -inator just might help him win...