The other night Mel Gibson introduced Brad Pitt into the Spike TV Hall of Fame. As Brad accepted the award he thanked Mel by saying "Thanks, Sugar Tits!"

Now we hear that Mel's "completely lost it," according to several online sites.

Radaronline.com reports:

In front of two priests and a visiting bishop, Gibson made a huge scene when he "paced back and forth, furiously telling the congregation that he would not stand by and be judged and scrutinized," a source told RadarOnline.com.

"Mel got up on his stage -- the altar -- and went off. He tried to intimidate the parishioners by staring at everyone with his angry eyes. Mel even threatened to shut down the church if people kept gossiping about him. The bottom line is that if Mel hadn't cheated on his wife and gotten his Russian girlfriend pregnant, there wouldn't be much to gossip about - he created this mess, and now he's trying to control it."

Back stage photo is Dee-Licious...