At least one journalist was warned of a possible under car booby trap. Dong-jin knocks Ryu unconscious with a booby trap. He kills civilians, and is killed by a booby trap. As the Imperial German Army retreats, they booby trap the whole town to explode. The captain finds his treasure chest, which now holds a booby trap. A booby trap may be of any size. Moments later, Buffy saves Cassie from a lethal booby trap. Hand grenades were used four times and a booby trap once. One GI is shortly thereafter killed by a booby trap. Nick freezes, and Grissom explains the booby trap to him. Pooch is hit by a booby trap set by Rick Flag. After forcing entry, they withdrew when they discovered a booby trap. The "rubber band grenade" was another booby trap. They disarmed an improvised booby trap (explosive device). The vehicle lurches forward over the pressure plates in the floor activating the booby trap.