"Go Poopypants!" is a song written by Dav Pilkey and performed by Petra Haden.
Deep Choir: "Go Poopypants! Go Poopy."
Deep Choir: "Go Poopy! Go Poopypants!"
"He had a brilllllliant miiiind! Inventing things to heeelp, at tiimes! He wanted to uncurl, secrets to the woorld! But everywhere he came, they all laughed at his name!"
"They laughed it out, of town, and tried to bring his spirits down! But now he's teachin' school, he might just keep it cool! They don't drive him insane, by laughing at his name!
Deep Choir: "Go, Poopy! Go Poopypants, Go Poopy! Go Poopypants, GO! Go, Poopy! Go Poopypants, Go Poopy! Go Poopypants, GO! Go, Poopy! Go Poopypants, Go Poopy! Go Poopypants, GO! Go, Poopy! Go Poopypants, Go Poopy! Go Poopypants, GO!"
(Children talking and George and Harold making armpit noises)
Poopypants: "Hello Boys and Girls! Go please take your seat, It's time for class to begin!"
(Children keep on talking)
Poopypants: "Very Good! Now, I'm going to be your new science teacher. Yeah, that's right! My name is Professor Pippy P. Poopypants. And--"
Poopypants: "Alright, Alright! T-T-That's quite enough! It's not funny! I can assure you! I'm going to count to ten, One..Two...Three!"
(Children still laughing)
Poopypants: "Stop right now! It's not funny! *groan* I am going to get my revenge IF IT IS THE LAST, THING I DO!!"
"Now the world is going to end! With the gerbil jogger 2,000! He's coming to your town, to shrink everyone down! And if we don't change our names, will never be the same! 'cause Professor Poopypants, will shrink us all like ants! Without Captain Underpants, We haven't got a chance!"
(CHORUS and poopypants laughing and police sirens)