I found the underhand trick of displaying a "next block" different from the one you're actually going to get totally threw me. It's weird when a subconscious response gets subverted, it's really difficult to take concious control back.
Always the s-shaped one? (Or the z-shaped) It guarantees you'll eventually lose.
Is there a Tetris AI that can play against this bastard? Has that been done already? Might as well let the computer try to outsmart itself.