Maybe that's why you didn't hear the noise behind you until it was too late.
Thank goodness for your ninja endurance! Product Details Some will scream, some will laugh, but all will be amazed by your gruesome injury! Your target was another ninja?! All in a day's work for one of the world's deadliest warriors! Made of Tough StuffWear it to a party, prank a friend - heck, even bring it to work if your boss has a strong enough sense of humor.