You try not laughing

A recent game of Circle of Death/Kings went like this:

"Category: balls."
"hairy balls"
"chocolate balls"
"tennis balls"
"basketballs"
"Caucasian balls"

wait, what?

"She said chocolate balls...so I say Caucasian balls..."
"I said chocolate balls in terms of the candy, the snack. NOT a black man's balls."
"oh"

Balls....it's just funny. No explanation needed. You try saying balls out loud without laughing (or anyone in the near vicinity laughing at you).