Tiny Wireless Motion Sensor

http://cre.ations.net/creation/a-tiny-wireless-motion-sensor

A tiny motion detector! (not my hand)

Eavesdrop on Any Room from 1000 Miles Away

Simple way to eavesdrop using a cell phone.

Build a Net Gun

 Haha a complicated to make but still very useful weapon.

http://www.instructables.com/id/Build-A-Net-Gun/

Real Time Phone Voice Changer

This is an awesome tutorial! The video of him using the phone is hilarious. :P

http://www.lucidscience.com/pro-phone%20voice%20changer-1.aspx

Motion Activated Camera

A tutorial that teaches you how to make a motion sensor/heat sensitive camera that will take a picture once it senses motion.

http://www.lucidscience.com/pro-motion%20activated%20camera-1.aspx

Laser Microphone for Long-Range Spying

This is a very cool way to spy and get audio that costs less than twenty dollars to make!

Link for how to make this is below and the final product in action is shown in the videos.

http://www.lucidscience.com/pro-laser%20spy%20device-1.aspx

Get Money from a Jammed Vending Machine

There are two ways to retrieve lost coins in the vending machine:

1.Flick the coin return knob hard, fast, and over and over in an attempt to fling the coin beyong the inner magnet of the machine.

Why?
"There's a magnet inside that grabs coins. A wiper tries to wipe the coin off of the magnet, but it rarely gets all the way to the far edge of the magnet, so a little bit of the coin holds on. When you release the coin return, the coin just slides back on to the magnet, and you're right back where you started."

2. "You need something to force all the coins further through the coin acceptor mechanism. Consider anything stiff enough to take some abuse, but not much thicker than a quarter. (popsicle stick, wire...etc.) Push your tool into the coin entry. If it's jammed right to the top with coins you'll push the whole stack and force some out of the other end.

Hit the coin return as described above.

Repeat as needed."

Courtesy of: http://www.instructables.com/id/ECZND35F2FRV8DQ/