There's something about Christmas tradition that's inherently a bit twisted. The very idea of a costumed man sneaking into your home to reward the good and punish the naughty is already pretty messed up -- and that's before you dive too deep into the truly creepy holiday mythologies from around the world. Even though Christmastime has been marketed as a Winter Wonderland filled with presents, carols, and good cheer, the truth is, there's always been a dark side.