Here it is
http://www.cardplayer.com/magazine/article/17590

It's not something that comes up too often, but it's quite reliable. If your opponent is waiting on you to react to a large bet, and starts mentioning hands that you could have, he likely can beat every hand he mentions. Obviously, there may be exceptions, but I've found this tell to be one of the more reliable ones that I use.

Ok he said "quite reliable" not "infallible" but you get the point.

ChezJ