Line Rider

This site isn't going to help you be more productive or save the world, but it will help kill some time when the clock just doesn't want to tick by. The idea is that you have a little dude on what appears to be a sledge or some sort of bike; you then draw a series of lines (go as crazy as you want) and when you are done tap the play icon. Before you know it the little dude will be riding the lines you created and most likely falling off at some point. It's not a world beater of a site, but it's fun.