Regular Show, Season 1

Mordecai:
We-oo! We-oo! We-oo! [imitating a doctor] Quick, doctor. Both of these buttcheeks are unrecognizable! If we want anybody to recognize this as a butt in the future, then we're gonna have to do a complete butt transplant, STAT!

Rigby:
STOP TALKING!!! There was only damage to the one cheek and you know it!

Mordecai:
[laughs] That's right. We used to call you "The One-Cheek Wonder!" Dude, I'm bringing it back.

Rigby:
You better not.

Muscle Man:
Is that One-Cheek Wonder? I hope he's not trying to play punchies with cheeks like that!

(shows Rigby's buttchecks)

Mordecai & Muscle Man:
(Laughs)

Rigby:
(Covers his buttchecks with his tail) SHUT UP!! Don't look at them! (Runs upstairs) I'll win at punchies, you'll see! (Slams the door then messes up Mordecai's side of the room) Dumb Mordecai!! I hate you!!

Mordecai:
(Offscreen) You better not be messing up my side of the room!

Rigby:
(Yells and picks up a phone book) YOU'RE RUINING MY LIFE!!!! (Throws phone book but the book bounces back at Rigby's face) AAAAAAAAAAAAAAAAAHHHHHHHHHHHHHHHHHH!!!!!!!!