I go jumped at a party in high school. I have no idea how many there were total, but I knew a couple of the people involved, mainly the guy who was having the party. I do know I got my @ss kicked and good. I ended up with a few stitches, a broken nose, a couple broken ribs, my left eye suffered some fairly serious damage that required me to wear an eye patch for nearly 6 months (and caused a 20-30% loss of sight and an obnoxious twitch that still troubles me off & on to this day 11 years later), and I was pretty much a black, blue and bloody mess from head to toe.
Apparently I associated with the wrong people.
My beating took place early in March my junior year in high school. It wasn't until the weekend before Halloween that I gave a little back. The people I hung with at that time were basically a bunch of brawlers anyway and they were more than happy to help me out. With their aid, a total of about 30 of us rolled up on a party at the same house where I got beat down. Greg & JJ got down on this guy as soon as we got there and took his car (late 70's Buick) and ended up driving it through the front door of this guy's house. You can imagine the chaos that ensued. When all was said and done the guy's house was completely trashed and he was a bloody mess as were the majority of the people there.
No one ever got arrested for anything that happened either of those nights, and the guy who's house got trashed was sent off by his parents, presumably to military/reform school and shortly afterwards they moved away.