Guy walks in to chip shop and walks up to the counter, and says "Give me a bag of fucking chips mate!" The shop owner behind the counter is non too impressed with him, and says "Excuse me! You don't come in here talking like that. You come and stand behind the counter and let me show you how to ask for chips properly".
So they swop places. The owner walks up to the counter and says "Give me bag of chips PLEASE". The man behind the counter says "FUCKOFF you wouldnt serve me!"