ONLINE POKER - SITE - Party Poker

I started my online play at PartyPoker. I like the inter account transfers, i like the volume of players around the clock, and I enjoy being the guy with the hat. What I don't like is the fact that on three different occassions I have seen pocket KK beat pocket KK. How many times can a flush splatter the board. I also had to leave party for the reason that when I make a big bet in 25 NL with pocket AJs and the board comes JJ6. Why would someone call with 54. This is after a healthy preflop raise. did he just figure he'd get lucky and catch a 23 on the fourth and river? What makes me sick is the 2 came on the 4th when I bet again. I went all in for my other 7 bucks on the river figuring he wouldnt possibly have the 5 4 or a J /236 after he called the flop. Anybody know who could have that sense to stay?