Heh, I adore most sensations -- roller coasters and spicy food included. And, uh, sensory deprivation, too. But spicy food is definitely my go-to "explain masochism in 60 seconds" example. And I did, at least once, accidentally throw myself preeeeeetty much into a seriously altered state when I took a bite of what I thought was a mildly spicy pepper to see how many I should put in the stirfry and it was a lot, lot hotter. I just sort of stood in the kitchen with a chili-blistered lip going "oooh" for a while. Later it just hurt.