Facing massive overbet by a maniac on party 5/10

[JMa]

Villain in this hand is Banzan, a huge LAG in party 5/10 SH games. This guy is the wildest player ive seen yet at those tables. The preceeding hand I c/red a raised pot on the flop Tc9c2x and took it down right there w/o showing the hand.

I make it $50 behind a limper w/ AcAd. Banzan is BB and calls, as does CO limper.

The pot is $150 going to the flop. The effective stack is $1500. The flop is 5h 4d 2h. All check to me, I bet pot. Banzan immediately raises all in. CO folds. Its $1300 to me to call this huge overbet.