hmm... most painful...may i share a few? yes? ok.
uhh, 6 years old, i jumped off a swing and my foot broke, all the tissue in my ankle and foot ripped, and being the 6 year old i was, i walked on it, and rode my bike on it, and didnt stop till my friends told me my foot was going to fall off.
9 years old, i got my ring caught in a dog collar when i went to stop it from running away, and it twisted litterally, all the way around. the x-rays showed the finger was barely conected anymore, and if my skin was ripped, i might not have a ring finger today