In the world of knives, there are a few that have special animations. One is the karambit, which is a small, curved knife that is used in Filipino martial arts. Another is the balisong, or butterfly knife, which is a traditional Filipino weapon that consists of two handles that hinge open to reveal a blade. Lastly, there is the switchblade, or automatic knife, which has a blade that springs out from the handle when a button is pressed.