What was your favorite toy when you were a kid? Regardless of your age -- whether you're of the Hula-Hoop generation or more of a Rubik's Cube person -- there are some toys that everyone knows. Slinky, Mr. Potato Head, Barbie, Play-Doh and Hot Wheels are still going strong, no matter how many video games flood the market. But how much do you really know about these classic toys? Take our quiz to find out.