that lead to fits of giggles.
(yes, that's it.)
Or how about Sweet Pickle's ever-popular...
Banana rotten squirrel.
(which may also be interchanged with: Banana rotten... playground/popcorn bag/skunk/stop sign/fill in the blank with whatever they see within their personal space at the moment and follow with fits of laughter and giggles into balled up fists)
Apparently, the word rotten added to anything equals hilarity, and "banana" is standard for whomever might be knocking at your door.