BRAD Pitt has bought anger management classes for Angelina Jolie to stop her from throwing knives at him when she gets cross. "The Curious Case of Benjamin Button" actor - who raises six children with Angelina - is said to be terrified that her knife-throwing will get out of control, and is hoping his gift will help calm her down. A source said: "Angelina has quite a temper on her and she has been known to throw a few knives around when she is angry. Angelina learned how to throw knives for the "Tomb Raider" movies. She is a practiced knife-thrower so it's a hobby and cathartic." "Brad is terrified Angelina will one day hit him with a knife, and cause him a serious injury or worse. Brad jokes about needing a stab-proof vest when Angelina is around" "That's why he bought her these Streaming Furies classes. It's a new relaxation technique based on breathing, meditation and Tai Chi." Angelina - who raises six children with Brad - is known for her fiery temper and had a famously tempestuous marriage to Billy Bob Thornton. - EXPO