My girlfriend called me as she was driving to an appointment.  She arrived, and I could tell from her voice that she was getting frustrated.  Finally she said, "I know I had my cell phone with me. And now I can't find it!"  

I replied, "Aren't you talking on it!?"  

There was a solid period of stunned silence as the reality of the situation sank in - followed by, "You are NOT going to tell anybody about this!"