I watched this Robin attack his own reflection in the bumper and headlights of this Duramax for about 5-10 minutes before I thought to video it. Sorry about the quality.

 

The bluebirds do a similar thing here. I have to put plastic bags over all of my mirrors because they attack their reflection and poop down the side of the vehicles while they bouce between the window sill and the top of the mirror. Dang territorial birds!

 

I was sitting in my truck eating lunch listening to the radio and looked over and he was really going at it at one point. He climbed all over the grill. Kept hitting the head lights. He was going to give himself a heart attack. I have never noticed that behavior before.