Make your own batarangs with the Wazer desktop water jet cutter
 

You're probably familiar with laser cutters, if only because of indelible images like Sean Connery strapped to a table as a red beam slowly makes its way toward his crotch. But in practical use the fire hazard and intense power draw can keep reliable...

https://www.engadget.com/2016/09/12/...er-jet-cutter/