I have made a pact with myself that I will never lay down KK pf. And on those rare occasions that I do run into AA I'll just chalk it up to the law of averages (or suck out). Buuuut, I do agree with rondavu that in this scenario you can make a strong argument for laying them down and cutting your losses to just $13. Given your limp (hoping for a raise) and all the action afterward against a tight opponent, I think that the conditions made it a perfect opportunity to make a good laydown. Problem is: if he didn't show you the Aces after you folded (if you had folded), this post would be a speculation post asking opinions on his holdings with no concrete answers. A no win situation IMO. Tough luck.