Okay. I've got one:
I was driving from Connecticut to Maine one Friday night with my 7 year old son and (another female) cousin in my old VW bug. We pulled into a highway rest stop on 495 so my son could pee; it was more a truck turn off than a rest stop--no facilities or lights. After walking my son to the bushes, we returned to the car and it wouldn't start for love, money or all the cursing I could summon. This was before cell phone days. Luckily, a cop was there and saw I was having trouble. He radioed a tow truck and left, saying it would be about half an hour.
It was summer. We sat in the car with the windows down, waiting for road side assistance. A minute or two after the cop left we started hearing laughing, hooting and hollering coming from the belt of trees that separated the turn-off from the highway. A couple of very inebriated guys appeared from the trees and hollered over, asking if I needed help. I hollered back, no, but thanks, a tow was on the way.
More laughing, hooting, hollering and the sound of splintering beer bottles from the trees. The two guys stood there consulting. I felt pretty threatened at that point, instinctively didn't want to be trapped, so I ordered my son to stay in the car, put up his window and lock the doors. (No worries about my cousin--she had gone semi-hysterical and broken out the Oreos). I got out and casually leaned against the car, keys in my fingers, ready to try and make the assholes bleed if they came closer. Which of course, they did.
One asked me if I'd like to have a little fun, some stupid shit like that, and I told him no, but thanks again, guys. Then I saw that my 7 year old had gotten out of the car and was standing behind me with a broken piece of the seatbelt housing as a weapon. The guys were still walking (staggering more like) and coaxing, "Aw come on honey, you'll have fun..." I was about as furious at that point as I have ever been in my life, because no one makes my seven year old watch his mother get raped.
Just before they got close enough for the situation to turn ugly, out of the darkness walks a man whose car I hadn't noticed there before. He asked if I was having trouble, and I told him a truck was on its way, but we had a while to wait. He went over to the drunks and talked to them low like, I have no idea what he said, but one of them gave my son a very sloppy apology, saying he didn't mean to scare him, and they retreated back into the trees. The hero got his flashlight, diagnosed my starter problem and stood there with me until the tow truck arrived, pretending he had nothing better to do.
I was pretending to be calm and all put together, but I have never forgotten that guy and I hope he knows how much I appreciated him that night. My "Thank you" didn't cover it.