Knock knock jokes

All this serious talk can be turned around to silliness by falling prey to Neph's newest "knock knock" joke. Here's my favorite one.

Knock knock!
Who's there?
Bertucci's!
Bertucci's who?
Ber-TUSHIES!!!

So what if he sometimes forgets proper "knock knock" form? His jokes still manage to provide the right function. And you try to resist a three-year-old's giggles! Let me tell you, it ain't easy...