Going into the bathroom:
Me: "10 minutes, 175lbs"
Other:"what?"
Me:"If I'm not back in 10 minutes, thats how much sh!t you should shovel out"
Whenever I say something intellectual, of figure something out for someone, I point at my head and say "Kidneys!" (from Red Skelton)
-or-
If its something clever, "Well I am a cunning linguist.."
I hurt myself: "Ow my ovaries!" (from Simpson's)
Proud of something, "Who's got two thumbs and (insert accomplishment)... This guy! (point at myself with thumbs)"
Whenever the wife leaves for work: "Have good Mosh Pitting!" (the goat, Adam Sandler)
If someone asks me how much drug to give, "RFL" (read the f'ing label)
"Don't discount luck, depend on it"
"If you can only spell something one way, it shows a lack of imagination"
If its a story and the other person is obviously not listening/uninterested or the story is going nowhere, I will wrap it up with, "And then I found five dollars! Yay!"
If someone spills their beer, "You know, every time you spill a beer, an angel burns in hell..."
I pull out alot of old movie quotes and song lyrics at times, but these are the things I do habitually that I can think of off the top of my head.