Being known to be a relentless tickle obsessed tickler and to be very ticklish all over a long, long time ago, I've been gang tickled in public a couple of times, for revenge and/or for pleasure (nearly as often as I tickled girls in public : fair payback) : in the playground, at the swimming pool or on the beach, during camps, in dorms, on the grass... But the most torturous experience was when I was gang tickled in a dorm, during military duty.
I've also been unmasked as ticklish many times at parties or at work by colleagues, mates, friends, for instance, coming from behind my back and poking my ribs. More recently, at a party, as I laid on a couch with shoes off (a bit teasing and asking for it, I confess), a friend of mine who crossed the room suddenly stopped in front of me and started tickling my soles, which made me cry, jump and blush - I thought I wasn't that ticklish anymore there).
Well, I feel getting tickled in public as a bit humiliating, because this unveals a weakness and, in some circumstances, makes the Ler in me feel weaker... But it's also part of the game. And this happens to feed fantasies and desires...