If you're going to jump into a body of water, it's best to know how deep that water is. At least, determine if it's deep enough.
This dude decides to forego all precautions before jumping into a river from a bridge situated 20ft above the water. Turns out, it's much shallower than he predicted.
The only good thing I can think of in this situation is that he jumped in feet-first and got away with only breaking one of his legs from what it looks like. Dude would be in a much worse situation or possibly dead if he dove in head first.