The following is a lijst of some of their greatest moments. Most of these are from the books. However, these first two are from the DH1movie. Enjoy!

Moody: Fair warning: it tastes like goblin piss.
One twin: How do u know what that tastes like? *sees Moody's glare* Just trying to ease the tension.

Both: *after transformation* Wow. We're identical.

Ok. Here we go with quotes from the books. Don't forget to comment. Also, add any I may have missed.

"Fred, u next," the plump woman said.
"I'm not Fred, I'm George," zei the boy. "Honestly woman, u call yourself our mother? Can't u tell I'm George?"
"Sorry, George, dear."
"Only joking, I am Fred," zei the boy, and off he went.

"Blimey," zei the other twin. "Are you--?"
"He is," zei the first twin. "Aren't you?" he added to Harry.
"What?" zei Harry.
"Harry Potter," chorused the twins.

"Aaah, has ickle Ronnie got somefink on his nosie?" zei one of the twins.

"Hang on, I think I remember him saying something about it," zei the other twin. "Once--"
"Or twice--"
"A minute--"
"All summer--"

"Blown up a toilet? We've never blown up a toilet."
"Great idea, though, thanks, Mom."

"Never mind that, do u think he remembers what You-Know-Who looks like?"

"We'll send u a Hogwarts toilet seat."

"We got Potter! We got Potter!"

"You must be good, Harry, Wood was almost skipping when he told us."