If you're traveling a lot and worried about someone breaking into your hotel room while you're sleeping, this little portable anti-burglary device could give you the peace of mind you're looking for. Essentially, it's a little wedge that sits under the door. If someone tries to open the door, it'll hit the wedge and an alarm will go off.
Sure, you'd then be awoken and have to deal with your intruder face to face, but it's better then the alternative of waking up in a bathtub full of ice with one of your kidneys missing. Think about it.