Huh?

Noah:  Hey, I just made up a joke! Wanna hear it?
Me: Yes
N: What's the smelliest sport?
M: ummm....soccer?
N: Nope! Guess, Sarah!
S: I don't know.
N: Just guess a sport!
S: Baseball.
N: Nope, it's ping pong!

[Silence]

N: Isn't that funny! I just made it up!
M: Okaaaay....why is it funny?
N: Because it's ping PONG! Get it?
S: No.
N: Pong is another name for poop! 
M: It is?  In what country?
N: I read it in my Big Book of Gross Stuff.
M:  Oh. Well then it must be true, so that's pretty funny.