hahahaha ewwww! :-D cool image!
Something similar happened to me - at a party with people I barely knew and never saw again after that - Chris, close your eyes you're going to have nightmares - something crawls on my hand - I look down just as an ENORMOUS (well, for a country where we don't do tarentulas) spider crawls on my arm inside my jumper's sleeve. So, to the sweet sweet music of Metallica, I started this frantic shake hoping to dislodge the critter while people looked on wondering if I had finally gone completely bonkers - and then when that didn't work and I could feel the thing crawling higher... well let's just say thank God for inventing the bra, without which that evening could have been really embarassing. For good measure I also proceeded to stomp thoroughly on my jumper as it whas laying on the floor.
I think the spider escaped, though.