Old Woman: Hello Master Prank Caller: Oh, yes, this is i'm a sure. Old Woman: I'm a sure who? Master Prank Caller: I-m-a sure glad I ain't Joe Mama! (Mordecai & Rigby both laugh at the prank call video) Oh, yeah! You just got pranked by the Master Prank Caller! Rigby: The Master Prank Caller is the funniest thing on the internet, right, Mordecai? Mordecai: Ye-e-eyah, I guess he's pretty funny. But you know what is even funnier than watching prank phone calls? Mordecai & Rigby: Hmm, hmm, hmmm! Pops: Hello? Rigby: Hello, Pops? Pops: Yes? Rigby: Please hold for a collect call from... Joe Mama! Rigby:: See?