Although I doubt this will ever happen, a samuri costume would be the greatest costume ever. Imagine, you're walking along, and a person comes up to you and asks if you're taken. You open up your magic menu, and there's samuri uber-decapitation magic. You target the person who asked the question, and BAM! You take your samuri sword and slice their face off. Three seconds later it comes back, so it isn't really lethal, but it still teaches them not to mess with a person in a samuri costume while that samuri is on a quest or something...