Let's start a little competition here. I just heard about this on a podcast (Gun Dudes, pretty entertaining) so I looked it up. It's a short video, but man it's hilarious! Enjoy, and post other ones so we can get some good laughs.
http://hypervocal.com/news/2011/dont-rob-a-convenient-store-with-a-cop-right-behind-you/
http://hypervocal.com/news/2011/dont-rob-a-convenient-store-with-a-cop-right-behind-you/