9. USB Air Darts
It’s been a while since a USB computer gadget entertained us with compressed-air darts. USB Air Darts is available for a mere $33.5 through various stores. This gadget is Windows and Mac-compatible and you can control it using a mouse. It is even possible to control USB Air Darts remotely using VNC and deploy those darts against your hated co-workers in the next cubicles.