You're right, but you shouldn't check in the dark with Aces or Kings or any "real" hand. The dark check, in my experience, ussually earns a free card on rag flops and flops your opponent might be afraid of. If your opponent checks behind you, and if you get a nice read on him, you can lead on the turn and take the pot with no pair or draw. Who knows, you might even win with the best hand.