My thinking about the Files is that they expanded their audience dramatically by adding comedy to the repertoire. I'd like to think DD kind of created the idea, because as we know he is a wellspring of wisecracks and probably adlibbed a few. Darin, the little flukey tagalong, turned out to be a genius at it, and I believe the two were friends.

"Humbug" is representative of DM's work in that there is a sweet and sympathetic center to all the craziness. Like most funny people, Darin felt the dark side intensely. This was especially obvious in CBFR, which is IMO his best ep.