For centuries ninjas have been known for their stealth, secrecy, and sword-play. Silent entry and quick escape, disguise and espionage, unarmed combat and judicious use of throwing blades are just some of the skills that make them bad ass. This collection of tees, hoodies, and stickers, highlights their lighthearted side—and lesser-known skills (such as percussion prowess) as well. You may be inspired to learn some new skills, too. Please check with your doctor before you begin any ninja agility moves.