There are a lot of ways to keep your stuff from getting stolen. Legendary DIYer Kip Kay shows us a bargain-priced alarm that will fit on just about anything.
All you need for this is some soldering skills, a cheap tilt switch (available at electronics stores), and a cheap vibration alarm like this one. By soldering the tilt switch in place of the on/off switch, you can make the alarm go off whenever it detects movement. That should keep your bike, laptop bag or other valuable ready to alert you of thieving scoundrels. Check out the video above to see the project in action.