A flopped straight hits massive aggression.

[Eeegah]

This was I believe the villain's second hand at the table. On his previous hand he also went bezerk, but seeing as he had QQ and a flush on the turn I couldn't really blame him. He did buy in with the minimum though if that means anything to you.

PokerStars 0.25/0.50 Hold'em (9 handed) converter

Preflop: Hero is BB with 3[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls, MP2 calls, <font color="#666666">2 folds</font>, Button calls, <font color="#666666">1 fold</font>, Hero checks.

Flop: (4.40 SB) 5[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP1 raises</font>, MP2 folds, Button calls, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">MP1 caps</font>, Button folds, Hero calls.

Turn: (7.20 BB) A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP1 raises</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">MP1 caps</font>, Hero calls.

River: (15.20 BB) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP1 raises</font>, Hero...

Yeah, them big blind specials are really something, and this guy seems to love his hand too. When the board pairs and I'm thinking about putting in the last two bets though (he's sure to cap it), something goes off in my mind. The most obvious hand he could have with this aggression is another straight, in which case we split--in fact, 3 betting and letting him cap here is bad for both of us since we just feed the rake.

More importantly, he'd also need specifically 43 to do so, and he'd have to be even loser than the average Stars .25/.50 fish to play that--although hey, it is connected and it might even be sooted!. So what else could he have? He could have been limping KK or QQ, in which case I'll just laugh my way to the bank. More likely though is him flopping Aces up or a set, and with a second Ace on the turn that spells bad news.

And so I'm torn: capping seems counterproductive here as a split is certainly possible, as well as a loss. On the other hand he could be an idiot; who knows. This is a toughie for me, and I'm not really clear how I should proceed. Do I go ahead and 3-bet here, or just call?