what to do with this KK??

[authority11]

Party Poker No-Limit Hold'em, $1 BB (9 handed) converter

MP2 ($98.5)
MP3 ($75.41)
CO ($91.45)
Button ($134.8)
SB ($102.95)
BB ($255.62)
Hero ($91.85)
UTG+1 ($125.69)
MP1 ($98)

Preflop: Hero is UTG with K[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">Hero raises to $4</font>, <font color="#666666">7 folds</font>, BB calls $3.

Flop: ($8.50) 6[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $20</font>, Hero calls $20.

Turn: ($48.50) 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $80</font>, Hero folds.

Final Pot: $128.50

I know calling that 20 was pretty bad, but for some reason I was just super scared of that bet, but I felt laying KK there would be weak as hell. I was hoping that calling the 20 bet would get him to slow down. No reads on this guy. What should I have done to the 80 dollar bet and what do you think he had?