Quote Originally Posted by Galapogos
I know I've advocated this before but here is a situation where I would like to know what you guys think.

Say some unknown just sat at the table a few hands ago, buys in full. You just witnessed a hand where he didn't raise preflop. It's between him and some other guy he has position on. Checks all the way to the river which is a Q. Board is not scary, check, check again. New guy shows AQ. Weird.

Okay, next hand you are in SB with KK, this new guy raises (!!!) Everyone folds to you and you reraise. He pushes. Do you call?

Keep in mind he has been at the table for maybe 5 hands and you have only witnessed this one. Do you figure maybe he was just being tricky or a super tight nit?
trivially easy call

fwiw, I'm not in the 'never fold KK' crowd, although I honestly can't remember the last time I folded KK pre but that's in a tough, aggressive shorthanded game where people have a clue and don't need AA or KK to go all-in before the flop.