Rivered flush faces scary oposition on paired board

[List]

Villain is unknown, no stats/reads. His flop play is a bit weird for a set, but not unheard of at these stakes. His river play is great if he has a set, which is why I found it really scary. Stack sizes seem perfect to fold the A high flush here. As a side note, I've been playing slightly laggy, but I don't think that effects this hand. My hand is pretty transparent here I think.

PokerStars No-Limit Hold'em, $2 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

SB ($330)
BB ($187.20)
UTG ($121.85)
MP ($475.10)
Hero ($374)
Button ($342.35)

Preflop: Hero is CO with J, A.
UTG raises to $6</font>, 1 fold</font>, Hero calls $6, 2 folds</font>, BB calls $4.

Flop: ($19) 8, 5, 2 (3 players)</font>
BB checks, UTG checks, Hero bets $14</font>, BB calls $14, UTG calls $14.

Turn: ($61) 5 (3 players)</font>
BB checks, UTG checks, Hero checks.

River: ($61) K (3 players)</font>
BB checks, UTG checks, Hero bets $40</font>, BB raises to $167.2</font>, UTG folds

[luckybacon]

i cant fold this here

[Praetor]

this is a real easy call

[cbboy]

I definately call here...

[List]

Clearly I overanalyzed, or badly analyzed this hand, but I called anyway. He turned up with a really weird hand.