Dav Pilkey — American Author born on March 04, 1966,

David Murray "Dav" Pilkey, Jr. is an American author and illustrator of children's literature. Pilkey is best known as the author and illustrator of the Captain Underpants book series. He also uses the pen names George Beard and Harold Hutchins, which are the names of two of the main characters in the aforementioned series. He lives near Seattle, Washington with his wife, Sayuri... (wikipedia)

These 'mistakes' occur in my books for a reason. I have an agenda: I'm secretly trying to inspire kids to create their own stories and comics, and I don't want them to feel stifled by 'perfectionism.'
Most kids are smarter than most grown-ups. Kids see the world in black and white... They look through all the garbage and see a world run by fools and dullards and lazy people. And there's nothing they can do about it because they have no power.
A book without potty humor is like a banana split without hot fudge. It can still be good, I suppose, but you kinda get the feeling that something is missing.
I created 'Captain Underpants' when I was in the second grade. I was constantly getting in trouble for being the class clown, so my teacher sent me out into the hallway to punish me. It was there in the hall that I began drawing 'Captain Underpants'. Soon I was making my own comic books about him.
Once I have the story in my head, I write it down. The illustrations usually come last.