50NL 87s Rivered Flush Faces Shove

[Numfar]

Villain was about 50/20 over 20 hands or so. I actually hadn't noticed him until this hand but he had just doubled up from this table's resident village idiot who had now left. He had typed "ship it" in chat.

I checked Flop because I thought that there was no chance he would fold. His FCB was 20%, the flop hit parts of his range and, on OnGame, big stacks don't fold flops.

I thought that the Turn was a pretty standard semi-bluff. He would fold here with nothing but I assumed he'd call with as little as a GSSD and maybe middle pair if he didn't believe me.

Hit Flush on River but WTF?

Poker Room skin
No Limit Holdem Ring game
Blinds: $0.25/$0.50
4 players
Converter

Stack sizes:
Hero: $49.25
Button: $48.20
SB: $42.25
BB: $114.80

Pre-flop: (4 players) Hero is UTG with 8[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/club.gif[/img]
<font color="#cc0000">Hero raises to $2</font>, 2 folds, BB calls.

Flop: 9[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/diamond.gif[/img] ($4.25, 2 players)
BB checks, Hero checks.

Turn: 5[img]/images/graemlins/club.gif[/img] ($4.25, 2 players)
<font color="#cc0000">BB bets $3</font>, <font color="#cc0000">Hero raises to $10</font>, BB calls.

River: 2[img]/images/graemlins/club.gif[/img] ($24.25, 2 players)
<font color="#cc0000">BB is all-in $102.8</font>, <font color="#cc0000">Hero ?</font>.