A simple Show Within a Show gag. With the sheer number of television stations available in this day and age, a channel that only has programming which relates to a single hobby or niche can be viable. Think "The Golf Channel" or "Soapnet" for real life examples of this. Naturally, these niche' networks aren't all that appealing to people who aren't interested in the networks' subject matter. Some shows like to exaggerate how uninteresting these channels are to non-hobbyists. They do this by having a character turn to a channel that only runs programming about an unbelievably inane subject 24 hours a day.