Ninjas may operate in pure darkness, effortlessly gliding between the shadows as they hunt their prey, but they still need to know when it’s time for dinner. The Citizen Eco Drive Stealth ($119) is the watch to wear when ninjaing it up. The ballsy-yet-stealthy black-on-black motif means you’ll never be a ghost as you hide in the bedroom closet, waiting for your girlfriend to finally put away jacket that she had to have taken off at least an hour ago! Geez! Oh and ninjas (and prank-playing boyfriends) don’t have time to worry about winding a watch, so the Japanese Quartz movement really comes in handy, keeping you battery-free forever.