You know how every time you meet an anorexic they will do that thing of laughing nervously and say: "Oh my gosh, no! I'm not anorexic -- I eat all the time."
Usually I just frown at them and try to channel whatever fatherly aura I might have to communicate to them that I know they are lying. Tonight I decided what I'd really like to do is say: "Yeah, I guess you're right. No way you could be anorexic with those fat arms of yours."
Or, maybe I won't say that.