A man spearfishing in Key West, Florida was bitten by an eight-foot reef shark. He's underwater and wearing a GoPro when the shark appears out of nowhere, takes a bite out of his leg, and leaves. Luckily the guy was able to get back to the boat.
He lost over two pints of blood but is okay.
(WARNING!!! There are F-bombs at 2:52 and 3:28. The shark shows up at 0:37. You get a good view of the bite on his leg at 4:07.)