In S1E18, Tristan tells Rory that he’s thinking about swearing off girls for a while. Rory laughs, and Tristan says, “You don’t think I can!” Rory answers, “No, I… I think you can. I just think it would be hard for you. It would probably involve some kind of lockup facility and one of those Hannibal Lecter masks.”
Hannibal Lecter is a character portrayed in a series of novels by Thomas Harris as well as in several movies and a television series based on those novels. He is a forensic psychiatrist and a cannibalistic serial killer. When he is imprisoned, he is fitted with a straightjacket and a mask that covers half his face, acting as a muzzle.