This nifty Cap Blaster Blowgun from ThinkGeek “comes with 6 darts, 1 dart holder/foldable sight, 144 caps, and measures approx 16.35″ long.” Video after the break.

Before shooting each suction cup-tipped, foam dart, you load a cap into each one. When the dart sticks to your target, the cap explodes with a load crack. Sometimes you can even see a spark. Here’s what our office ninja recommends: fire one dart at a wall nearby your target. The sound will cause confusion and fear. Then, use the rest of the darts (without caps) to quietly take down any running “coworkers.” You’ll be in the shadows – no one will know it was the ninja