A booby trap is a device or setup that is intended to kill, harm, or surprise a person or animal, unknowingly triggered by the presence or actions of the victim. As the word trap implies, they sometimes have some form of bait designed to lure the victim towards it. At other times, the trap is set to act upon trespassers that violate personal or restricted areas. The device can be triggered when the victim performs some type of everyday action, e.g., opening a door, picking something up, or switching something on. They can also be triggered by vehicles driving along a road, as in the case of victim-operated improvised explosive devices (IEDs).