1. maybe sorta? would need definitions of adult and also of a fistfight.
2. don't recall.
3. i don't expect it, but that's happened.
4. would depend on circumstances.
5. no.
i'm kinda different than what i think is the normal pattern. i was pretty pacifisty as a youth and young man, then got kinda angry for several years as an adult (i'm mostly more calm again now) and initiated or responded to several confrontations. none of those ever escalated into a fistfight, but i kinda wanted all of them to. in retrospect, i wish i had gotten in more fights as a youngster when it was more socially acceptable. i think it would have been good for me.