the quick version is this....
parents gone on vacation, little sister has 3 rules at home, no booze, no boys, no parties... all 3 were broken.
enter me, older brother, with 8-ish years of studying martial arts...
i kindly explained to a young man that he needed to leave ("you need to get the f*** out of my parents house right now before i knock your teeth down your throat").
he headed towards the stairs, then turned back and said he wasnt leaving, and i said "i swear to god, YOU ARE". he walked toward me, put one hand up as if he was going to push me, i stepped forward, grabbed his arm with one hand, and his throat with the other, and threw him down the stairs hard enough that he never touched the floor, he hit the wall and fell....
i walked down the stairs towards him, at which point he decided it would be wise to head to the door before i got there, which was a wise decision indeed. he promptly went outside, in the rain, in his socks, without his car keys. i left him out there for about 20 minutes, opened the door, and threw his keys in his face.
i never saw him again. and i lived happily ever after.