TV
If this van's a-rockin'... we're in there doing it.
— Michael Kelso • That '70s Show

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker begins with the familiar rhythm of a warning about a rocking van, then finishes with a plain explanation of sexual activity inside. The pause invites anticipation before the blunt conclusion. Humour comes from spelling out the implication with cheerful, unnecessary directness.
Context reviewed