Fun stuff is taking a turn for the worst. Sort of.
As the title states, what weird thing, event, sound, taste, or whatever at least somewhat sexually arouses you (something a little further than getting some adrenaline flowing)? Actual erotic things do not count!
Strangest for me I would have to say is being in the presence of any high speed attack aircraft taking off, or performing a high speed, low pass flyby. F-16, F-15, Tornado, Typhoon, Rafale, you name it. @_@