Really funny jokes-Better sandwich

My girlfriend and I were picking up some sandwiches from the sub place last week and she asked the clerk which of two sandwiches was better. The clerk didn't have an opinion but did say that the first sandwich was more expensive. My girlfriend got a quizzical look on her face and asked,
"If that's the case, why are they both listed with the same price on the menu?"

To this, the clerk responded, "I don't think we add tax to the turkey."