Let's see.... I have KK, it was capped pre-flop. And, yes! Of course an A has to come on the flop. I bet out and get raised; I know I'm not good so I fold. These other two go at it. And just to make it even more interesting another A falls on the river.
Only when I have KK UTG do all 4 of the Aces in the deck come out to play.