How can you subvert a camera equipped with a facial-recognition system? With crochet! Howie Woo crocheted a mask with a series of detachable facial features that make you look more like a cartoon character than a real, recognizable person.
Hey, these could be useful for creating real-life rage faces, too! There's a video at his site that shows how the system might work, in which a camera discovers that Woo is addicted to potato chips and has one outstanding parking ticket. Link