Here are a list of things that Donny says "Bye bye!" to on a regular basis:
* Christoper Walken (see earlier entry on "The Guy")
* the Christmas Tree
* the Christmas lights around the front door
* the house
* the stovelight
* the dishwasher
* various stuffed animals
* "Daddy's sneeze"
* "Stuff in there" (referring to contents of a bureau that he's been banned from opening)
The best part is the intonation of his "Bye bye!" is very dreamy--I've likened it to the gamine Hollywood starlet saying goodbye over her shoulder after one too many cocktails.