I have a nice thin line down my stomach, skipping a bit, then a small thick scare. My mum was swinging me under my grandparents armchair when I was about 10, but there was a spring sticking out the bottom and obviously it sliced me open.
That's when I first learnt about the psychology of pain, I looked down and saw the thin scar so I thought it was just a thin cut, then I looked further down and saw a deep cut and I could see something purple, which I assume was my insides, then a wave of pain rushed over me as soon as I noticed it.
Then a less innocent thin scar on my left forearm where at a party I was blind drunk, I entered the toilet, pissed all over the floor, fell into a vase, fell and rolled around laughing in my own piss and broken shards of vase, I woke up with lacerations all over and no explanation for it.