The very dumb joke that made me hang up on my sister:

Q: Did you get your updog?
A: Updog?
Q: Did you get your updog?
A: Did I get my updog.
Q: Yeah. Updog. Did you get your updog?
A: (Exhales.)
Q: (Stifling giggles) Well, did you get it? Your updog?
A: What?
Q: UP DOG.
A: UP DOG?
Q: Updog!
A: What the fuck?
Q: (Cracking up) You messed it up! You were supposed to say "What's updog?" and I was going to say "Nothin' much."
A: (Click.)