I remember when the Rubik's Cube debuted, it was a craze that all of my friends were into and it took forever to do the puzzle.  I don't think I was ever able to solve it, although I did take it apart and put it back together again with all the colors in the correct place.  Recently the World Championships for the Rubik's Cube were held in Las Vegas and the winner finished in 7.36 seconds!  Amazing!