People
You can’t deny laughter; when it comes, it plops down in your favorite chair and stays as long as it wants.
— Stephen King

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Laughter is pictured as a guest who doesn't ask permission. Once it arrives, it settles into your favourite chair and makes itself at home, and you can't push it out. Trying to hold back a laugh is pointless.
Context reviewed