Way back in 2005, we took three hundred gingerbread shuriken (with chocolate tips) to Seni, the big martial arts expo in the UK. There’s now a page on the Fudebakudo website documenting how these remarkable weapons came about (OK, the ones we made were just replica weapons).
As we are responsible vendors, at Seni we refused to sell these to unaccompanied children (in fact, we put a notice up to such effect). How prescient this was. One can only imagine the chaos that would ensue were they to get into the wrong hands, as shown by this BBC news story about the school ban on triangular flapjacks.