In which I have a tough riv decision after unusual line

[emil3000]

Opponent is decent TAG on the tightish side, doesn't seem to be out of line too often, fairly straightforward. I have sort of a normal/good image I think.

I have 77.

Seat 2: fanboi ($3,802.50 in chips)
Seat 3: derZonk ($5,194.50 in chips)
Seat 4: fafa41 ($938 in chips)
Seat 6: syntaxeror ($1,940 in chips)
Seat 7: TMoose1 ($2,000 in chips)
Seat 8: YesIdid83 ($4,544 in chips)
Seat 10: -BlackKitty- ($1,803.45 in chips)
ANTES/BLINDS
syntaxeror posts blind ($10), TMoose1 posts blind ($20).

PRE-FLOP
YesIdid83 bets $80, -BlackKitty- calls $80, fanboi calls $80, derZonk folds, fafa41 folds, syntaxeror folds, TMoose1 folds.

FLOP [board cards 8C,QH,7S ]
YesIdid83 bets $225, -BlackKitty- folds, fanboi calls $225.

TURN [board cards 8C,QH,7S,4S ]
YesIdid83 bets $550, fanboi calls $550.

RIVER [board cards 8C,QH,7S,4S,10C ]
YesIdid83 checks, fanboi bets $1,000Seat 2: fanboi ($3,802.50 in chips)
Seat 3: derZonk ($5,194.50 in chips)
Seat 4: fafa41 ($938 in chips)
Seat 6: syntaxeror ($1,940 in chips)
Seat 7: TMoose1 ($2,000 in chips)
Seat 8: YesIdid83 ($4,544 in chips)
Seat 10: -BlackKitty- ($1,803.45 in chips)
ANTES/BLINDS
syntaxeror posts blind ($10), TMoose1 posts blind ($20).

PRE-FLOP
YesIdid83 bets $80, -BlackKitty- calls $80, fanboi calls $80, derZonk folds, fafa41 folds, syntaxeror folds, TMoose1 folds.

FLOP [board cards 8C,QH,7S ]
YesIdid83 bets $225, -BlackKitty- folds, fanboi calls $225.

TURN [board cards 8C,QH,7S,4S ]
YesIdid83 bets $550, fanboi calls $550.

RIVER [board cards 8C,QH,7S,4S,10C ]
YesIdid83 checks, fanboi bets $1,000, YesIdid83 raises to 3689...

I have about 2k left. Call and laugh?