Video: You know you're old as hell when the only way to find out what young people are doing is to have other old people explain to you what the youths of today are doing, because you don't actually know anyone young any more. That's basically water bottle flipping. If you've done it, you're young (or pretending to be young). If you've never done it, you're old. If you've done it with mercury instead of water, well, you're... a nerd. A cool nerd, but still.