My grandma was slow, but she was 90...
Mess with the bull, you get the horns (not original, but useful nonetheless...)
Paybacks are hell (usually used after I tried to be funny by digging my elbow into his ribs for no reason...which I did A LOT.)
And my personal favorite:
Why don't you get outside and blow the stink off of you?
That's what spring is all about, right? Getting outside and blowing that inside-air-of-winter stink off of you?
(Oh, and getting super excited about a pretty rock that you accidentally found...in the pile of pretty rocks surrounding the air conditioning unit that your mother has told you A MILLION times to stay out of, of course.)