Back when I was in college there was a story in the news about a guy who was out one night in NYC wearing his ninja boots. As he was leaving a restaurant/club/some establishment a passerby started making fun of his ninja boots, saying "Hey, nice ninja boots, you some sorta ninja?" or words to that effect. So the ninja kicked him in the head and killed him. Unfortunately this happened 15 years ago, so I can't find any reference to it online, but during the course of my search I did find ninja haikus and related ninja content, so it's not like I was wasting my time.