Got told I had 'a nice tight arse' once while running past a local pub in a wet-suit. I felt violated.
PS - if you do this make sure you
a) have an escape route that is faster than they can run
b) You are in ther right gear
c) they don't get a hold of you
d) Laugh out loud and point at them as you ride away.
Run hard, run fast, don't die...
I then leant in and took his keys and rode off back down the hill - the look on their faces told a thousand words.
I tossed the keys in a bush about a mile away and went the long way home. LOL