Punji sticks are sharpened bamboo stakes used as a booby trap in warfare, primarily by the Viet Cong during the Vietnam War. These stakes were often hidden in the ground and designed to injure or kill unsuspecting soldiers who stepped on them, serving as a psychological and physical tactic to disrupt enemy movements and instill fear. Their use reflects the guerrilla warfare tactics that characterized the conflict, where the Viet Cong relied on deception and surprise to combat a more technologically advanced U.S. military.