You know what, now that I think about it, this actually did happen to me, and it was like three weeks ago. :lol: I can't believe I didn't remember immediately. I was at a show and after my set I walked through the crowd, and this girl just randomly tickled me, and I automatically tickled back (well, I tried, I tend to do that ball-up thing when tickled), and a few seconds later when she stopped I looked up and it was nobody I'd ever seen before (I was about 2,000 miles from home), and she introduced herself.
It was awesome, but very unexpected. :lol: I can't believe I forgot, I made a point of memorizing her and we tickled each other periodically again through the night.
Rave culture is very physically open though so something like that is more acceptable amongst us. I think the ravers in my area are particularly open to it, as there are several of us tickle types in the scene making it happen with regularity (as in, I don't think a single one goes by without some pretty serious tickle fights). It's totally awesome. :lol:
At this same party a friend of mine introduced himself by signing somebody's ass, just so you get a feel for how relaxed physical boundaries are. :lol: