Booby trap

A booby trap is a device or a setup designed to surprise, harm, or kill a person or an animal.

These devices are unique because they are triggered by the actions of a victim. A victim might trigger a trap by opening a door, picking up an object, or switching something on. Some traps even use bait to lure a person toward the device. They can also be triggered by vehicles driving on a road, such as improvised explosive devices, also known as IEDs. While they are sometimes used for practical jokes, they are most often associated with warfare and criminal activity.

To understand how they work, we must look at the different ways they are triggered. Most military booby traps involve explosives, often using between 250 grams and 1 kilogram of explosive material.

Because these devices are rigged to detonate within one meter of a person, even small amounts can be deadly. There are three main types of triggers: pressure, pull, and pressure release. A pressure trigger works when someone steps on or sits on an object, such as the Russian MV-5 pressure fuze.

A pull trigger, like the Russian MUV pull fuze, is often connected to a tripwire that is pulled when someone walks by.

A pressure release trigger activates when someone lifts or shifts an object, such as moving a box that was holding a switch down.

Setting these traps effectively requires exploiting natural human behaviors. People often act out of habit, curiosity, or a desire to protect themselves. For example, a trap might provide a simple solution to a problem to lure a victim. In the Vietnam War, soldiers used punji sticks, which were sharp spikes hidden in grassy areas.

When soldiers were fired upon, they would instinctively throw themselves to the ground for cover, which caused them to land on the spikes. This used the human instinct for self-preservation against the soldiers themselves.

The history of the term "booby trap" is quite interesting. It likely comes from the Spanish word "bobo," which means a fool or someone easily cheated. In 1590, the English used the word "booby" to describe a specific type of seabird in the genus Sula. These birds have large wings and flat feet, making them very clumsy on land. Because they were easy to catch, they were often eaten by sailors. Originally, the phrase "booby trap" referred to harmless schoolboy pranks, but the term took on a much more serious meaning during World War I.

History shows that booby traps have been used in many different conflicts. During the Vietnam War, Viet Cong soldiers used "Grenades in a Can," where a grenade with the safety pin removed was placed in a container. They also rigged rubber band grenades in huts. In Northern Ireland, during a conflict known as the Troubles, various groups used booby traps to target security forces and civilians. The Provisional Irish Republican Army (IRA) was a frequent user of these devices. According to the Sutton Index of Deaths, 180 people died from booby trap bombs during the Troubles, many of them laid by the IRA. One common method was the car bomb, which exploded when the vehicle was started.

In the Middle East, booby traps have also been used extensively. During the Second Intifada from 2000 to 2005, Palestinian groups used them to prevent the Israeli army from entering cities. In the Battle of Jenin, an insurgent claimed that between 1,000 and 2,000 bombs and booby traps were planted.

Some of these devices were massive, containing up to 110 kilograms of explosives. To clear these dangerous areas, the Israeli army used armored Caterpillar D9 bulldozers. More recently, in 2024, an operation involving the mass detonation of remanufactured pager devices was reported in a conflict involving Hezbollah.

Because booby traps are indiscriminate, they pose a major risk to people who are not part of a fight. They can harm civilians, the wounded, or even the dead. For this reason, international rules like the Protocol on Mines, Booby-Traps and Other Devices strictly prohibit their use against noncombatants. It is also illegal to booby-trap food, drink, or medical equipment.

While some people still use harmless versions for practical jokes—like a bucket of water over a door—the real-world use of these devices remains a serious global concern for safety and law.