50/100 HU hand vs mjorgenson

[whitelime]

We've been playing HU for maybe an hour. No hands in particular that are relevant in this case. This is the first river c/r that either of us has made though I'm pretty sure I showed down something that was a whiffed river c/r. Most importantly, we've played a decent amount against each other, though not much HU, and we both know the other to be a good thinking player. What is the worst hand you call here with?

FullTiltPoker Game #2269711313: Table Andi (heads up) - $50/$100 - No Limit Hold'em - 2:14:12 ET - 2007/04/23
Seat 1: mjorgenson13 ($10,549)
Seat 2: whitelime ($32,437.25)
whitelime posts the small blind of $50
mjorgenson13 posts the big blind of $100
The button is in seat #2
*** HOLE CARDS ***
Dealt to whitelime [? ?]
whitelime raises to $300
mjorgenson13 calls $200
*** FLOP *** [K [img]/images/graemlins/club.gif[/img] 4 [img]/images/graemlins/heart.gif[/img] 2 [img]/images/graemlins/heart.gif[/img]]
mjorgenson13 checks
whitelime checks
*** TURN *** [K [img]/images/graemlins/club.gif[/img] 4 [img]/images/graemlins/heart.gif[/img] 2 [img]/images/graemlins/heart.gif[/img]] [A [img]/images/graemlins/diamond.gif[/img]]
mjorgenson13 checks
whitelime bets $400
mjorgenson13 calls $400
*** RIVER *** [K [img]/images/graemlins/club.gif[/img] 4 [img]/images/graemlins/heart.gif[/img] 2 [img]/images/graemlins/heart.gif[/img] A [img]/images/graemlins/diamond.gif[/img]] [9 [img]/images/graemlins/diamond.gif[/img]]
mjorgenson13 checks
whitelime bets $1,100
mjorgenson13 has 15 seconds left to act
mjorgenson13 raises to $3,800
whitelime ?