Rabbi met Pop:

Rabbi - Shalom, how are you?
Pop - Good, how are you?
Rabbi - Oh... just now I had meal in restaurant, woow... It almost killed me when I saw the bill...
Pop - Oh... never mind, I'll teach you how to have good meal and never pay the bill!...
Rabbi - Sure, show me... :?

They went into restaurant and had good meal - ordered almost everything, after that they stay there until restaurant was about to close and all staff left except one Waiter...

Waiter approached them and ask - Gentlemen, we are closing soon, would you mind to pay bill first?
Pop - We already did pay the bill to one of your colleagues who just left...
Waiter - Oh so sorry...
Rabbi - By the way, he still have not give us change!