The most pain I've ever received from a punch in my entire life was when my best friend's little sister, who was 15 at the time, 95lbs, had fists the size of tangerines and was a blackbelt in Okinawan Karate because there was almost nothing else to do in rural Virginia besides hang out at the Karate studio when you're a teenager, punched me in the arm because I was winning at Mario Kart. She focused all her power into the "crippling pain" spot on my arm. For those of you who have never been in a fight with someone who knows what they're doing, your arm has a "crippling pain" spot.

A later story involving this girl was when she was being hassled by some young men at a gas station (cuz there are very few places to hang out in Rural Virginia), while the local cops - whom she got along great with - were watching from across the parking lot. One of the boys shoved her. She punched him. He was out for quite a while, pushing the "dangerous" amount of time unconscious, so the cops walked over calmly and made sure an ambulance was not required. When the boy was conscious again, one of the cops said "Son, there are two things you need to know. One, never shove a girl. Two, never shove that girl."

TL;DR: Don't underestimate the teenage girl.