Crowded subway technique #14:
Smile and pretend to enjoy the grope. Even go so far as to guide his hand. Then when he is totally relaxed and distracted, bend his fingers backwards. He will scream in pain and everyone will know what he was up to as he skulks away.
Crowded subway technique #3: one large, sharp hatpin.
Crowded subway technique #8: Pick your nose and look for a place to put it.

I watched as a rather sleezy man groped a poor unsuspecting "out of towner" one morning. I pushed over in her direction, smiled and said "Hi Ann! Do you know THIS man" as loudly as possible. People turned; he froze and skulked away. She cried. Shouldn't have gone anywhere alone if she was that intimidated.

Carole Ann - please tell me this was not a Peter, Paul, and Mary concert? Or Pete Seeger? Neil Young, maybe...

I got felt up at the ballet once. Never at the opera. That must mean something. Sorry for the ramble. Can't sleep.