Humor and fashion are more interesting when they're more unfamiliar, and the audience has the feeling they're from territory that's not fully explored yet by anyone. Humor and fashion in new mostly-unexplored territory is interesting because it makes the audience feel like they can learn to explore that new territory themselves and come up with new stuff others will find interesting. Old humor and fashion is usually less interesting because there's the understanding that its territory has probably been well explored and mined for content in the past by others, regardless of whether the territory is familiar to a current audience.