Put the cap back

Timothy, a doctor, and Gregory, an attorney, in separate cars collided on one foggy night. The fault was questionable, but both were shaken up, and Gregory offered Timothy a drink from a pocket flask. The doctor took the flask with a shaking hand and belted back a couple of swallows. As the attorney
started to put the cap back on the flask the doctor asked: Aren't you going to have one too, for your nerves?" The attorney replied: Of course I am, after the Highway Patrol gets here.