For me personally it was getting some of my arms skin getting shoved between two desks that I had my arm resting on after someone slammed them together tightly during high school

Left a red line that took a while to go away

Edit I just remembered something wven more painful then this

I’m going to copy paste my comment reply to someone else below

"You reminded me of the one time I was visiting my uncle as a child and I ended up puking in the car because the sun was hitting the back of my head in summer, and this was Australian summer where It can get hot and humid

I don’t know if it was a migraine but it was painful as fuck"

There was also the time i got rope burn from tug o war in primary school but the car headache that was potentially a migraine was more painful