The second-best hand in poker. But sometimes you have to let it go.
Pocket Kings is the second-best starting hand in Texas Hold'em, winning ~83% against a random hand. In 99.9% of situations, you should get your money in preflop with KK and feel great about it. But there are rare, specific spots where folding Kings is the correct play.
In a cash game, the answer is simple: don't fold KK preflop. Even if you're 100% sure your opponent has AA (which you never can be), the math still barely supports folding. And in reality, opponents who 4-bet and 5-bet shove have ranges that include QQ, AK, and bluffs — all of which KK crushes.
The only theoretical cash game fold: a super-tight nit who has literally never 5-bet without AA in 50,000 tracked hands. Even then, you're making an assumption that could be wrong.
Tournament situations where folding KK might be correct:
Post-flop is where you'll fold KK more often. An Ace on the flop changes everything. When an opponent who called your preflop raise bets into an Ace-high flop, they have an Ace a significant percentage of the time. Continuation bet, but if you face a raise, the disciplined fold is often correct.
If you're considering folding KK preflop, you better have a very specific reason backed by ICM math or an extremely reliable read. "I just have a feeling" is not a reason to fold the second-best hand in poker.