I've picked up lots over the years and lost lots with every major move I do, but when I was young I picked up saying 'mon ami' in my casual speech from Gambit. I liked comic books a lot. This directly translated to 'my friend' after my small obsession with the show Invisible Man, and since has changed back to French, but it doesn't happen too often anymore. Then again, my verbal speech is extremely different than my written speech, eh.

Other than that, I chew on penlids when I'm typing (or more lately, honey sticks) and I know I picked that up from a roommate, but I can't remember which one. Not sure, but because of it, everyone keeps asking me if I used to be a smoker. o.O