In Donnie Darko there is an exchange between Donnie's parents about some behavior over which they were called in to see the principal. Later, they are sitting together, eating in silence, each lost in their own thoughts, until:
Rose Darko: I don't think telling any woman to forcibly insert an object into her anus is something that should go without consequence.
Edward Darko: I think we should buy him a moped.
Rose Darko: I think we should get a divorce.
(beat) They both start laughing.
That exchange could make it into a movie based on the 'Rule of Funny', but I was wondering, is there some deeper significance to it that I missed?