Whats the best comeback you ever said to anyone?

Funny. Recently I encountered an incident with a real ignorant and nasty woman on the bus who swore I purposely stepped on her sneakers. Anyway as she was walking away she yelled out "f@ck you go comb your hair"

and my response was:

"f@ck you. go lose some weight and take care of that bad ass dye job you got in your hair"

She walked away with her face red and everyone onn the back of the bus laughing hysterically at her.