KK big pot, three bet on turn.

[Spicymoose]

I never fold. You are getting 18:1, plus implieds (and those implieds could be big if he has QQ). Furthermore, He 3-bet preflop, making him much less likely to hold a 7. He may have AA or 77, but he is playing pretty weird. If he is a maniac he might have A7, but then if he is a maniac, he could have worse holdings (AQ, or others).

I cap if he is really wild, but usually just call down.