In this deleted scene, Ron doesn’t like to joke with Ann.

Ann Perkins:

“Knock, knock.”

Ron Swanson:

“Knock, knock.”

Ann Perkins:

“You’re supposed to say who’s there.”

Ron Swanson:

“Knock, knock.”

Ann Perkins:

“Who’s there?”

Ron Swanson:

“Get out of my office.”