He’s no stranger to scandal, but Mel Gibson really outdid himself when he unleashed a string of abusive rants on ex-girlfriend Oksana Grigorieva -- and she had the audiotapes to prove it. Grigorieva -- who told People in October, "I thought he was going to kill me . . . I needed to document his threats" -- alleges the actor-director punched her in the face while she was holding their daughter, Lucia. Gibson refuted the claim and accused Grigorieva of leaking the tapes and trying to extort him for millions before doing so. Both sides of their stories are under investigation.