Hitting TP on the turn vs a maniac

[fabadam]

Another hand from a session review.
MP2 villain is a near-maniac, with something like 64/30 preflop and an amazingly low folding percentage postflop. He's folding out a lot of opponents post-flop with his aggression. We've seen howdown of several total junk hands already, but still he doesn't seem a total idiot, just likes the gamble and the fight for who has the biggest balls.

Party Poker 1.00/2.00 Hold'em <font color="#0000FF">(9 handed)</font> link

Preflop: fabadam is Button with A[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/spade.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">MP3 raises</font>, <font color="#666666">1 folds</font>, <font color="#CC3333">fabadam 3-bets</font>, <font color="#666666">2 folds</font>, MP3 calls.

Flop: (7.50 SB) 3[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
MP3 checks, <font color="#CC3333">fabadam bets</font>, MP3 calls.

An autonatic c-bet for me, even if I know the dude won't fold, or maybe especially so.

Turn: (4.75 BB) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP3 bets</font>, fabadam ???

I'm interested to hear what to do here. Assume villain is a LAG, but not a totally random one. If that's too vague, just tell me what you do here.