While on a car trip, an old couple stopped at a roadside restaurant for lunch.  The old woman unfortunately left her glasses on the table, but didn't miss them until they were back on the highway. 

By then, they had to travel quite a distance before they could find a place to turn around.  The old man fussed and complained all the way back to the restaurant.

When they finally arrived, as the old woman got out of the car to retrieve her glasses, the old man said,

"While you're in there, you may as well get my hat, too."