These are a few of my favorites:
Bop (the sound the "baffles" make coming out of the toaster)
No-no (in a pitch to match mine)
When I walked out of his room at daycare this morning and waved to him, he waved back and then blew me a kiss, complete wtih sound, "Mwwwwwah!!"
Puts the inefficient and confidence-blowing meeting that I attended last night into a bit of perspective.