A priest, a father, and a rabbi are walking home from their respective services when they pass a bar.

The priest says, "I wish we could all go in and have a drink tonight." To this the father says, "let me try something I'll be right back."

So the father goes into the bar, sits down and orders a drink. When the bartender comes over to get paid the father says, "my son, I have already paid you for my drink.", to which the bartender replies, "I'm sorry father, it must've slipped my mind." "It's alright my son. You have a good night", the father says and leaves.

He goes outside to tell the priest and the rabbi what to do.

The priest goes in and comes out successful, so the rabbi goes in.He orders and when it comes time to pay he says to the bartender, "listen sonny I have already paid for my drinks tonight". Now the bartender replies, "I'm sorry rabbi, you're the third man of the cloth to come in here tonight I must be slipping!", to this the rabbi replies, "that's ok sonny, but can I have the change from my fifty."