A Bouncing Betty is a World War II era mine that is featured in every Zombies map of Call of Duty: World at War and in every revised World at War map in Call of Duty: Black Ops.
The Bouncing Betty can be bought off the wall and obtained via Console Commands. Like in multiplayer, the player must press the respective key to take the Betty out. It can be useful in tactics such as camping and can be used as last stand efforts when the players are surrounded. Also, the three gun glitch of Verruckt and Der Riese require the player to have Bouncing Betties.