One hilarious, if painful for Timmy and Jimmy, was when Jimmy gives their creation the name "Shirley" and assures him that it's a cool name. When "Shirley states "Beware the wrath of SHIRLEY", Timmy, not known for having very much self-control anyway, bursts out laughing saying "That's the dumbest name ever." Shirley angrily says to Jimmy "You gave me the dumbest name ever?". The look on Jimmy's face is PRICELESS!
After Jimmy loses his genius, Timmy and Jimmy end up using useless inventions from Jimmy's lab. Timmy yells reactively "Cosmo, you idiot" before apologizing due to habit and correcting "Jimmy, you idiot."
From the first one, Crocker is sitting in a locker, about to press the button to go to the Crocker Cave, when Principal Waxelplax walks up and sees him. They look at each other for a few seconds, and Crocker screams "FAIRIES!"