Thew found this video a few weeks back...very effective if you need a good laugh :)
My abs felt like I had done a million crunches after watching this...I giggle like a little kid every time I think about it, actually...
Some background info...these guys installed train horns on their trucks & film themselves driving around & blowing the horn at random people. The video series is aptly titled, "Terror on the Streets"...haha