Well as a young kid I thought it would be cool if I could light a small part of my body on fire and then the fire would magically go out. TLDR: it didn't
I sprayed axe body spray on my arm in a line and lit it on fire. I thought it would just light the axe on fire briefly then dissipate, but nah the fire needed something else to kindle so it chose my skin. I was with a friend and I was like "I'm on fire! help" so he gets a wet towel and we put it on and thus I had a scar for about a year.
So yea mildly painful, but no lasting effect.