"Karma's a bitch" Not sure where I picked it up, but it fits well when someone gets what they deserve.

"Don't poke the bear" Taken from my ex (who is from South Jersey) to indicate when you're getting yourself in trouble or when someone's in a bad mood.

"Who do you think you are, slatting around here like the Queen of Sheeba?" from my maternal grandmother to let you know you were getting a little too big for your britches.

"Go it, ya sonofabitch" when something (usually mechanical) isn't doing what you want it to do, learned from my father in the garage many years ago...