The $1/$2 maniac who bets huge on a wet board is not always bluffing. Sometimes he flopped the nuts and he bets the same way because he always bets huge. Don't call him down just because it's him.

Why they do it

This is the maniac trap. You've been calling him down correctly all session and now you think you have him figured out. But maniacs have strong hands sometimes too - and they bet them exactly the same way. The read isn't "he always bluffs" - it's "he bluffs more than average." There's a difference.

The adjustment

Call him down based on board texture and your hand strength - not just his image. A wet board that hit his range is a slow down spot even against a maniac.

What it's worth

Hero calling a maniac on a board that smashes his range because "he always bluffs" is how you lose a stack with second pair. Use his image as context, not as a conclusion.