Bill and Doug went into a diner that looked as though it had
seen better days. As they slid in a booth, Bill wiped some crumbs from the
seat. Then he took a napkin and wiped some moisture from the table.
The waitress came over and asked if they wanted some menus.
"No thanks," said Doug. "I'll just have a cup
of black coffee."
"I'll have black coffee too," Bill said. "And
please make sure the cup is clean."
The waitress shot him a nasty look. She turned and marched
off into the kitchen. Two minutes later, she was back.
"Two cups of black coffee," she announced.
"Which one of you wanted the clean cup?"