World's Wackiest Races

On your mark, get set, check out the world's wackiest races. Racers compete in wild feats of strength and speed -- sometimes even in stilettos -- carrying brides and pushing hospital beds.

See if you can escape zombies in the annual Run For Your Lives 5K obstacle race. This is one race where a muscle cramp may spell the start of even bigger problems -- like being caught by brain-eating zombies!