Just another hand that bothers me. What to do in these situations? The guy was 57/25 over 69 hands, with a total agression of 9.7!

Full Tilt Poker $10.00 No Limit Hold'em - 9 players
The Official 2+2 Hand Converter Powered By DeucesCracked.com

BB: $4.90
UTG: $3.50
UTG+1: $10.33
Hero (UTG+2): $10.68
MP1: $10.12
MP2: $21.26
CO: $3.50
BTN: $10.00
SB: $13.19

Pre Flop: ($0.15) Hero is UTG+2 with K K
2 folds, Hero raises to $0.40, 4 folds, SB calls $0.35, 1 fold

Flop: ($0.90) J J 9 (2 players)
SB checks, Hero bets $0.90, SB raises to $2, Hero calls $1.10

Turn: ($4.90) 2 (2 players)
SB bets $10.79, Hero ???

Gritted teeth call. Guy could show up with a large range of hands here that you beat, ie; 10 10, A 9, 8's and a few other pocket pairs bet wierdly. Even hands like 10 Q and pure air could be bet this aggro by a player like this. Obviously a lot of J's, and even 9 9 could be played this way so it is a marginal call. I suppose it is upto you and your reads, have you seen this guy bet a big hand aggressively before?
At the micros a lot of hyper-aggro players freeze up when they hit something big so it is pretty easy to play them. They bet, you're winning, they check, you're losing. However, not all of them are completely ******ed and every now and then you will run into one that has the awareness to unpleasantly surprise you by over-betting their monsters.

I think i have to snap as he rarely does with a hand that beats you.

Call. Snap actually. The best way to win money off them is to let them hang them selves and sometimes it will feel a bit marginal, but honestly, the number of times I have seen these clowns turn some random underpairs into a bluff I cannot count. Yes, he can have the J but not as much as he is trying to rep it.

Call. Yea he has a jack sometimes, but he also has retaeded stuff like a 9 and gutters and tens etc etc.