David is visiting his parents for dinner one Friday night. Whilst she is getting the table ready, his mother asks him to get the olives from the fridge. He opens the fridge to look for the olives and notices that taped to the inside of the door is a risqué photo of a lovely, slender, perfectly built, but naked young woman.

David asks, “Mum, what’s the photo for?

She replies, “Oh, I put that there to remind me not to eat too much.”

David then asks, “So, is it working?”

“Yes and no.” she replies. “I’ve lost 15 pounds but your father has gained 20 pounds!”