Really really really really really stupid. I'm glad you were not hurt.

But I'm glad someone had enough of a lapse in judgment to make this video because the video demos of styrofoam kicking back and gruesome photos of injuries aren't effective enough to drive the point home. I'm glad you had the filming capabilities available to take maximum advantage of the [really big and dumb] risk you took. I hope that every single woodworker that ever visits an internet woodworking forum, currently or in the future, will see it. I have no doubts that hundreds, maybe even thousands, of woodworkers are already making adjustments to their saws based on this video.

A groundbreaking moment in woodworking history? I won't go quite that far, but with the power of the internet, this is a really nice contribution to the woodworking community and one I will remember.