Glennz has documented an excellent way for ninja to relax on their days off.

I like this game because you can hit the chicken.
Ninja Brawl.

Actually, wearing a headband that reads, “Ninja”, breaks a lot of the rules we have about concealment, secrecy, etc.

Ever been out on a job or maybe just shopping for shuriken when suddenly you realize, “Crap!  I left my ninja hood at home!”  Well, have no fear!  Turns out any ordinary t-shirt (perhaps one of ours) can be turned easily into your very own hood.  Full instructions here.