ask him to help with our new business venture: Seeing Eye Cats - for the blind who are both allergic to dogs AND willing to be led by someone who ignores them.
My Father-in-Law has a lot of fun with unsolicited conversations. His example from when credit card companies used to call him is a great example. "Oh! I'm so glad you called! Your timing is perfect, I was just about to declare bankruptcy. How much money can you give me?"