Actually that's a bearded fireworm if I'm not mistaken and you're in for a world of hurt if you touch one accidentally without a good glove on (they're common around reefs). Their venom isn't fatal though, if that's any consolation.
Being a diver I'm of course in the 'kinda cool' category with the others, sorry!
Snail is all like ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff ffffffffffffffuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu