My Wife's Secret Affair

While getting my car washed, the owner handed me a pack of cigarettes. I said I'd quit, thanks. The owner said he found it under my seat. I froze. I've never lent my car to anyone. Oh, wait, my wife drove it a couple of days ago when I was on a business trip. Holding the cigarettes, my heart sank. After dinner that night, I joked with my wife, 'Honey, have you been letting another man drive my car behind my back?'