Aces Everywhere!

Ok, now I don't want to sound whiney... but how often does this happen to everyone? I'm playing the PL Room at PartyPoker. .25/.50 blinds. I get AK.... position and what not doesn't matter much here, I don't remember really. But it gets to probably 3 players pre-flop. Flop comes AKx (rainbow)... I can't be beat at this point im figuring. So I make a good size bet, get the 3rd player out... and get called by one other. Turn comes with another K.... ok, now Im in great shape... Bet a little more this time... Get another smooth call... I am thinking I have to be up against A with a high kicker, or maybe a K.... and he hit his set... but I'm leaning toward the A with a lower kicker since I just got called there. So the river comes with a blank, and he goes all in... I'm like WHAT? Best hand I could put him on was a lower full house, or a set of kings.... I make the call, and he turns over AA!! Now what are the chances of this? I have an Ace, another Ace flops, and this guy has the last 2! To make it even worse, It happened like an hour later with Kings.. and me and my girlfriend were joking about how he probably has KK and has us beat again. AND HE DID! (different guy). But seriously... does this happen to everyone a lot or what? Cause it sucks, and just seems unlikely to me. There are only 4 Aces, and 2 people use all 4 of them on one deal. I know it was possible, but can anyone say they actually would have put him on that hand? I really doubt it!