Crack of the egg

A joke that would only be funny 2 the person telling it and they know its not funny 2 anyone else. The crack of the egg at the end is them trying 2 make it funny.

Guy 1: You've got 2 be kitten me!
Guy 2: Wow...
Guy 1: Crack of the egg (knee slap)
Guy 2: Dude, just no!!