How to catch a fish using a mouse trap

If you've ever wanted to catch a fish with a trap designed to catch other edible, living things, your time has arrived. I'm not sure if this is a technique that's common knowledge in outdoor circles, but it's frigging brilliant.

Also, what's the deal with the guy in the top left corner of the video, two minutes, fifty-five seconds in? He just kind of melts into the tree. Creepy.