I played a CC event a couple years ago and due to how the guy was playing I had him on A/A. I had K/K.
It was the only moment I seriously contemplated folding K/K. I wanted to fold, but I remembered Harrington saying that nobody is good enough to fold K/K correctly often enough to make it a profitably play. So I called.
He had A/A.
I flopped a set FTW.
In the micros I ran into a few players who were so tight/predictable that they'd only stack pre-flop with A/A or K/K. And the odds
of running into another K/K are very slim. So I can see folding to them. But for the most part, they're not foldable pre-flop. one out of 25 or so times this happens, and you get burned. But them's thebreaks.