* George and Harold's revenge on the teachers and Melvin by becoming "Principals for a Day" in ''Attack of the Talking Toilets''.
* The TakeThat comic they draw making fun of Melvin in ''Big Bad Battle of the Bionic Booger Boy''.
* In ''Wrath of the Wicked Wedgie Woman'', the boys trick Mr. Krupp into giving Ms. Ribble a card that says "You're one hot mama! Will you marry me?" Also doubles as a CrowningMomentOfFunny.
** Also,when Captain Underpants defeats Robo George and Harold 3000.
* Dav Pilkey's principal as a child told him he'd never make a living as an artist. Fast forward to now...