Meet Spike Away, the brainchild of industrial designer Siew Ming Cheng. It protects your personal space by poking anybody who gets too close. It's perfect for crowded trains. It's not perfect for cuddling and watching a movie with a lover. Did I mention it's waterproof? You can wear it in the shower! Why you'd wear it in the shower is another question, one that probably involves wondering what you'd look like as a naked warrior.
Keep going for a couple more shots of the design.
Thanks to ROM, who protects personal space the old fashioned way: not showering. Not showering and cacti.