I had been at the table for about 15 minutes when this hand came up. JoCamara7 had been playing around 90 percent of his hands and was about the loosest player I've ever seen at any stake. His re-raise all-in on the river baffles me.

***** Hand History for Game 2766244875 *****
$2000 NL Texas Hold'em - Saturday, September 24, 06:03:16 EDT 2005
Table Table 54881 (No DP) (Real Money)
Seat 10 is the button
Total number of players : 10
Seat 1: StraycatTNT ( $1052.70 )
Seat 3: sidinman1 ( $1289 )
Seat 4: JoCamara7 ( $2192.50 )
Seat 5: smallstakes ( $1347 )
Seat 6: ChinaTown02 ( $8375.50 )
Seat 7: b9291974 ( $3845 )
Seat 10:PO$$E$$ED ( $1950 )
Seat 8: ROC_a_fella_ ( $669 )
Seat 2: ThisStoneAge ( $427 )
Seat 9: nanonoko ( $2000 )
ThisStoneAge posts small blind [$10].
sidinman1 posts big blind [$20].
** Dealing down cards **
Dealt to PO$$E$$ED [ 8s Js ]
JoCamara7 calls [$20].
smallstakes folds.
b9291974 folds.
ROC_a_fella_ folds.
nanonoko folds.
>You have options at Table 54667 (No DP) Table!.
PO$$E$$ED calls [$20].
ThisStoneAge raises [$101].
sidinman1 calls [$91].
JoCamara7 calls [$91].
PO$$E$$ED calls [$91].
** Dealing Flop ** [ Qd, 3s, 8c ]
ThisStoneAge checks.
>You have options at Table 54667 (No DP) Table!.
sidinman1 checks.
JoCamara7 checks.
PO$$E$$ED checks.
** Dealing Turn ** [ 2c ]
ThisStoneAge checks.
sidinman1 checks.
ChinaTown02 has left the table.
JoCamara7 checks.
PO$$E$$ED checks.
** Dealing River ** [ 8h ]
ThisStoneAge checks.
sidinman1 checks.
JoCamara7 bets [$300].
>You have options at Table 54667 (No DP) Table!.
PO$$E$$ED raises [$999].
ThisStoneAge folds.
sidinman1 folds.
>You have options at Table 54667 (No DP) Table!.
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MR_COLEY: he bluffin
JoCamara7 is all-In.
PO$$E$$ED is all-In.
PO$$E$$ED shows [ 8s, Js ] three of a kind, eights.
JoCamara7 shows [ 7s, Ks ] a pair of eights.
JoCamara7 wins $242.50 from side pot #1 with a pair of eights.
PO$$E$$ED wins $4119 from the main pot with three of a kind, eights.

Why