Priests' Friday Meal

Okay, you absolute donut, let me break it down. You see, you said 'priest' and 'Good Friday'. Now, a priest is a holy man and Good Friday is a religious day when they can't eat meat. But you, being the smooth brain that you are, you made the connection that nun sounds like 'none' and that's the joke. You're so dumb that you probably think this is very clever. You should be ashamed.