Probably something we've all experienced. He was laying on the horn behind me for a good 30-40 seconds, then pulled up abreast of me, slowed down to my speed (about 12 MPH) and started shouting. I couldn't understand him, so I continued to ignore him. Then, still going my speed right beside me, he swerved over into my path of travel. I avoided getting hit by braking.

As soon as he did this, I started shouting his license plate number, both to help remember it and to let him know I was noting it. He kept going slow in front of me, still shouting stuff that was unintelligible, then eventually turned off.

Kind of ruined my trip to the grocery store.