<human>: Summarize the given text in a few sentences.

So my dad and I went canoeing over the weekend, something we both very much enjoy. As we were drifting down the Harpeth, we pass a bunch of college guys drinking and partying on the side of the river.  This was no problem, except they simply disposed of beer cans, pizza boxes, and other shit by throwing in the river. We ignored there assholishniss and continued enjoying the scenery. When we get to the end of the trip, it turns out they were right behind us the entire time (the river was to winding to see). As we get out and head back to our car, continue to follow us. Turns out they had parked right next to us in an older Mercedes SUV. Right as we are about to pull out, the driver slams his door against my dad's car, denting it pretty badly. Of course my dad rolls down his window to confront the guy, only to hear him yell quite loudly, "FUCK OBAMA!" after looking at the stickers on the side of our car. Then, without saying anything else, he drove off at a moronic speed over grass. To top it off, he almost drove into us at 50 mph on the single lane road back to town. If my dad hadn't of swerved, he would have clipped or side pretty damn hard. I do have his license plate number if anyone knows how to track him down.
<bot>: Drunk guy dented my dad's car, yelled at him, and then tried to hit him on the way back to town