Strange push?

[Saborion]

Party Poker No-Limit Hold'em Tourney, Big Blind is t300 (3 handed) converter

SB (t2530)
Hero (t1540)
Button (t3930)

Preflop: Hero is BB with 5[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/diamond.gif[/img].
<font color="666666">1 fold</font>, SB completes, Hero checks,

Flop: (t600) Q[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/heart.gif[/img] <font color="blue">(2 players)</font>
<font color="CC3333">SB bets t2230 (All-In)</font>
<font color="green">Do I call this? Why would he overbet the pot that much if he had a hand? If he has the nuts and I've been making weird calls, sure, but I haven't been out of line.</font>