Themes and tone vary from episode to episode, but they all contain elements of comedy, horror, or twisted humor in addition to the plot twist. The first series was… Well, there’s an episode where two teenage boys are trying to find their family. This would most likely be the first of the episodes in which we would see the “unforeseen” death of someone from the main line. In general, the first series is the most terrible of all. In other series, we see somehow more humor, but still, they are.
But the second episode is the most disgusting episode of all. “I’ve never heard of this form of sex”, “Is that what he wanted?” etc. Like it’s a show for perverts.