Fortunately, because I'm in a job where paper-cuts are an occupational hazard, I have boxes of bandaids (all sizes). I got to play the piano later that morning with a firmly placed bandage on my third finger. This didn't throw me over-much, fortunately, as there are many occasions in which I've needed to play with bandaging:
- Shows using excessive glissandos. Depending on the heaviness of the keyboard, I occasionally end up bleeding (and eventually developing a 'glissando callous')
- Pieces with octaves EVERYWHERE. My pinkies need reinforcement.
- Excessive practicing in general - the bit where the nail meets the finger can get quite tender
I've also heard that cold, cold weather can lead to split fingertips (some pianists use nu-skin for this problem). I'm lucky to have avoided THAT problem, so far. But I'm curious about other people's 'war stories'. One doctoral student I know had a serious kitchen accident right before a recital: his response? "I'll just have to re-finger everything." Tell your story in the comments section.
Important information for all: remember when in the kitchen - Always curl your fingers inwards when cutting!