Because the board paired on him…

PokerStars Game #21841160854: Tournament #119033226, $11.00+$0.50 Hold’em No Limit – Match Round I, Level II (15/30) – 2008/11/07 17:13:57 ET
Table ’119033226 1′ 2-max Seat #1 is the button
Seat 1: Teh Jinx (1375 in chips)
Seat 2: JVSauber (1625 in chips)
Teh Jinx: posts small blind 15
JVSauber: posts big blind 30
*** HOLE CARDS ***
Dealt to Teh Jinx
Teh Jinx: raises 60 to 90
JVSauber: calls 60
*** FLOP ***
JVSauber: bets 90
Teh Jinx: raises 180 to 270
JVSauber: calls 180
*** TURN ***
JVSauber: checks
Teh Jinx: bets 310
JVSauber: calls 310
*** RIVER ***
JVSauber: bets 955 and is all-in
Teh Jinx: calls 705 and is all-in
Uncalled bet (250) returned to JVSauber
*** SHOW DOWN ***
JVSauber: shows (a straight, Nine to King)
Teh Jinx: shows (a full house, Jacks full of Eights)
Teh Jinx collected 2750 from pot
*** SUMMARY ***
Total pot 2750 | Rake 0
Board
Seat 1: Teh Jinx (button) (small blind) showed and won (2750) with a full house, Jacks full of Eights
Seat 2: JVSauber (big blind) showed and lost with a straight, Nine to King