Ask Me About My Ninja Disguise T-Shirt

How do ninjas infiltrate parties to complete their covert missions in total stealth? They simply dress as normal civilians with a quick change disguise built into these cool new Ask Me About My Ninja Disguise T-Shirt. It may look like a normal black t-shirt with a typical unfunny saying written across the front, but when a victim inevitably reads it out loud, the bottom of the shirt is flipped up over the head to reveal to them that a deadly ninja warrior has suddenly appeared out of nowhere. If anyone laughs, unleash a few shuriken ninja stars and disappear back into the night with a smoke bomb.