9. Bluetooth Blues
Bring a Bluetooth earpiece with you to work. When you spot an unattended cell phone, sneak over and pair your earpiece to the phone, making sure the device's Bluetooth functionality is activated.
The Final Product:
The next time your friend's phone rings, intercept the call and start chatting away, hands-free-style. Confusion and hilarity will ensue.
Next: Disappearing Desktops