Not only have I folded KK. I have folded AA.
The situation was in a tourney with the bubble coming up. AA and KK are great but lets face it. It is just one pair. Some bozo goes all in with small suited connectors and can hit two pair or a set or a flush or a straight. I want to get some money out of the tourney, especially a freeroll where I am trying to get started with a bankroll on some site.
so yeah, I believe there are times to fold big pockets