It’s polite to applaud.
Bill is at a stand up comedy event and it's the moment when the performer finishes his bit.
Bill wants to react to the end of the performance.
Bill stands up and begins to clap loudly and cheer and whoop it up for the comedian.
Bill stands up and begins to walk out towards the exit to go back home.
The comedian notices Bill and is delighted that Bill seems to have enjoyed the performance.
The comedian notices Bill walking out and is sad because he assumes that Bill hated the pefrormance.