It's panto time!!

Our book-keeper, Colin, went to the panto in Southport at the weekend, and he tells the story about getting an ice-cream during the interval. He wanted a vanilla tub, and he could see three boxes, one with strawberry tubs, one with chocolate tubs, and the third empty. He said to the lady selling the ice-cream "Oh, you don't have any vanilla left.". To which she replied, "Oh yes I have". Guess what Colin said in reply. "Oh no you haven't!" Laughter all round!!