Do you have to laugh when your boss tells a joke?

The boss joined a group of his workers at the coffee urn and told a series of jokes he'd heard recently.

Everybody laughed loudly. Everybody, that is except Mike.

When he noticed that he was getting no reaction from Mike, the boss said,

"What's the matter, Mike? No sense of humor?"

"My sense of humor is fine," he said. "But I don't have to laugh. I'm quitting tomorrow."