You have to weigh up the situation as it unfolds, I have on occasion folded Kings pre-flop even Aces, but on other occasions I have called an all-in bet with pocket eights, Why?
Because before the action got to me the player on my left shoved all in and I believed he had an ace at the very least, there were also two other players who called his all-in bet and I then thought perhaps they were playing a similar hand, A/K or A/Q etc.
I didn't think for a second anyone would call with anything less, and even if someone was lucky enough to be holding a big pocket pair like A/A, why did they not raise to isolate? I decided that my pocket eights might improve, where pocket Aces couldn't if the other two players were all-in with A/K or A/Q etc. So I went with my gut feeling, re-raised with my 8/8 and took out 3 players.
Some would say I was lucky, Some might say I was a skillful player, I prefer to think I had a good read on all three players and went with my intuition. Any pair pre-flop has a good chance of winning over anyone holding Ace/Rag, especially if three players had decided to play with A/K or A/Q or whatever.
When the fun Stops, STOP!