Living with Bob and "Al"

When Sheri picked Bob up from "work" (Code for Adult Day Center) yesterday, Sheri noticed Bob had developed a cough. As they were driving away from the Day Center Sheri said " Bob you are coughing where did you pick that up? Has anybody at work been sick?" "Al" with his thumb in Bob's belt loop stretching out his back in his usual way replied " Not possible, I haven't been to work".  :)