What was your favourite pointless discussion? Some strange digression which did not advance the plot but was funny as hell.

I will nominate 2: From "Achilles Hill", where Frasier's reference to Nietzsche's superman becomes a discussion of Bizarro Superman, Blue Superamn & Superfly.

Or the cold opener wherein Frasier's essay on the films of Ingmar Bergman leads into a hilarious Abbott & Costello-type routine.