This is the stuff that nightmares are made of. It's not a new video, but I just stumbled across a guy who came across a rattlesnake pit. He decided to let his GoPro get a closer look and then it ended up in the pit. NOPE.
A diver down under was testing out his GoPro when he got the surprise of his life. He jumped into Sydney Harbor, and swam very quickly out with a tight sphincter!