fold to the conspicuous turn raise?

[Mister Z]

Party Poker 2/4 Hold'em (10 handed) converter

Preflop: Hero is UTG+1 with T[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">4 folds</font>, CO calls, Button calls, <font color="#666666">1 fold</font>, BB calls.

Flop: (8.50 SB) 9[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, <font color="#CC3333">Hero bets</font>, CO calls, Button calls, BB folds.

Turn: (5.75 BB) 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, CO calls, <font color="#CC3333">Button raises</font>, Hero ???

I'm kind of torn on whether to call or fold. Board is scary and I'm under the computer desk weeping. The 2nd 6 falling makes for a nice semi-bluffing card for CO, but this felt more like he was trying to extract value.