Earlier today, I accidentally stabbed my hand with a knife while cutting a zip tie. The cut is a centimeter deep and needed to be stitched to keep it from bleeding nonstop. Currently, my left hand is essentially useless; any movement of my thumb results in a nasty sting and the redness beneath the bandage growing darker.
No french drops, no zarrow shuffles, no passes, no pinky counts etc. for me for the next week or so. Hell, I can't even work on making gimmicks.

Moral of the story: be careful with your hands. Don't be careless and stupid like me.