Silly Bandz

These goofy wristbands are just silicone rubber, formed into shapes. That's it. A pack of 24 sells for around five dollars and was invented by Robert Croak, who told CBS news in 2010, "I definitely feel like I'm one of the luckiest men alive." Seeing that this invention has led to a fortune estimated at 15 million dollars, we'd say that sounds about right.