It's a bird, it's a plane, it's not on the damn menu!

I have to say, one thing that really upsets me is when a guest tries to order something that is not on the menu that day, is out of season, or is just plain never on the menu. They always have that smug look of "oh I already know what I'm getting and haven't even looked at the menu." You know the guy, he is sitting back all relaxed looking like a douche, then it comes time for him to order and he firmly says "I'll have the sea bass." Now at this point you realize he just ordered something he has probably never even ordered here before, yet has the need to feel like he's so awesome that it is on every seafood menu in the world! When you do tell him that we don't have sea bass because of the ethics behind it, he gets all angry because now he has to read the menu like a normal person and figure something out, and all this is of course the servers fault because we should have known he was coming in and at least gotten 1 piece of sea bass for this lucky douche. Hell I frequent many restaurants, yet I still read the menu to make sure that the item I usually order or am in the mood for is still on the menu, and if it isn't, I'm not going to revert to my childhood self and throw a tantrum. This even goes so far as to be too similar to the person who believes something is on the menu when it never was and never will be.