I won a tournament on a cruise against a guy who I think was doing this. He was one of the people at the table who had a consistent tell and that helped me beat him heads up.
The tell was a very common one. Anytime he liked what he saw, either hole cards or on the flop, he would quickly glance at his chip stack (thinking about a bet). Probably didn't even realize he was doing it. When it got to head to head, if he glanced at his chips...I'd fold early. If he didn't, I'd bet into him until he eventually folded.