Slow Dance with a member of the opposite sex!
I have 3 sisters... my parents would allow us to have parties... the rule was if you danced with someone you had to be at least a "bound volume" apart! I remember on party where I got a little to close and was rudely reminded of the "rule"... I was (am!) a sarcastic little bugger (not to mention the black sheep) and said "well they come on CD now ya know"....
Did I get in trouble for that one!! LOL