Dave Spencer’s Weird Eye Trick [VIDEO]

Remember the old David Letterman segment called "Stupid Human Tricks?" Well, I have one, although I never made it onto the show. (Like I really would have.)

My sister taught me how to do this when I was 10 and I have no idea how she did it since it doesn't seem like something you can teach because it's all dependent on muscle control.

But she did, and I learned it and here it is: