I remember when we used to mildly bump each other in high school. Ahh, the days.
Only time I was ever in a real rear end bump, was when I was driving home late at night sometime around 3am. Had been up for like 30 hours. Was sitting at an intersection red light, stopped, dozed off, my foot loosened off the brake a tad just enough for me to crawl into the back bumper of the guy in front of me.
I pulled off for them at a nearby gas station and helped them checked the damage, of which there was none. But, they were freaking the fuck out and demanded to see my insurance and wrote down my license tag, then demanded my phone number, claiming I was drunk and they were going to file a report with the police.
I told them I was just tired, I had not been drinking, and the police showed up, confirmed my side of the story, and dismissed them. I was pretty wired by that point and only 15 minutes away from home, so I just got back in my car and drove off.