Movies
People say crazy shit during sex. One time I called this girl "Mom."
— Randal ‧ Clerks

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker supports a general claim about strange remarks during sex with an awkward personal example. The sudden reference to calling someone 'Mom' supplies the surprise. The anecdote makes the point through embarrassment and incongruity, without explaining the cause of the slip.
Context reviewed