TV
Come with us back to Dallas, November 1963. Be a second gunman. The gunman behind the grassy knoll.
— Lister • Red Dwarf

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker invites someone back to Dallas in November 1963 and offers the role of a second gunman. The casual invitation makes a sinister scenario sound like an excursion. Within this fictional dialogue, the conspiracy premise serves the joke rather than establishing a historical account.
Context reviewed