When i was about 5 or 6 years old, i went swimming in the local sportspark. Unfortunately for me, on the way out, a HUGE automatical iron door closed just as i was about to exit. I thought i could be quick enough to quickly grab it open, but i underestimated the weight of the door, and it continued with my hand still holding it. My finger was crushed.
Luckely, through reconstructive surgery and some excellent doctors who acted quick and smart, i recovered most of my thumb, Now it only looks a bit odd, but it works, and it doesn't hinder me from playing console games at all
Apart from that:
when i was 10, i got a bone deep scar on my my index finger from when i was cutting wooden stick. The knife slipped... (i was a scout for 7 years)
When i was 6, i got 3 scars on my scalp from when i hit my head on a concrete floor with pointy rocks. All the holes needed 3 - 5 stitches
I also have a scar the size of 4 keyboard keys on my left elbow from when i fell on my bike