Characters
Let him have it. It's not wise to upset a wookie.
— Han • Star Wars: Episode IV - A New Hope
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker recommends giving in, then explains the suggestion as a matter of avoiding an upset Wookiee. The mild phrase 'not wise' makes the warning sound understated. Its humor lies in presenting a potentially consequential confrontation as something that can be settled with simple courtesy.
Context reviewed