List of running gags

Running Gags
Phineas and Ferb has a lot of running gags. Here's a few examples:

"Watcha doin?" said by:
Isabella (main character to say it)

Lawrence

Phineas "That Sinking Feeling"

"where's perry?" said by:
Phineas (main character to say it)

Irving "Hide and Seek"

Ferb "Cheer Up, Candace"

Lawrence