Drippings, usually. Of course, I would scrub myself, but I have a tendancy to fall asleep in the shower, eating up valuable time. Usually it's my legs that get neglected because of this strange phenomenon.
Now, falling asleep in the shower without falling down.. that's a skill I've got down pat for sure. I don't think I've ever fall down in the shower, but from the spot I stand in, if I were to fall (probably because I've lost my balance in my sleep) I'm sure I'd get the nozzle in the head on the way down, and the tap in the spine. (I have a shower/bath combo thinger). I bet that would hurt quite a bit. Glad it hasn't happened yet.