Fewer fans are more evangelical than those of the television show Sherlock - from creating memes, to fan art and even writing entire fictional universes.
They even have a Wikihow page with 11 steps to correctly be a fan.
But in a new interview, Sherlock star Martin Freeman - who played Dr Watson in the series - has revealed that fans loved the show to death, saying their expectations were so high that creating the show was just "not fun anymore."
It was "kind of impossible" to live up to the fans' expectations, Freeman revealed to The Telegraph.
"Sherlock became the animal that it became immediately," he said.
He explained that while the UK series The Office was a "slow burn", Sherlock was "frankly notably high quality from the outset".
"Being in that show, it is a mini-Beatles thing," he concluded.
"People's expectations, some of it's not fun anymore. It's not a thing to be enjoyed, it's a thing of: 'You better f**king do this, otherwise, you're a c***.' That's not fun anymore."
When the actor was asked if there was any discussion of a fifth season, he responded "not massively", blaming the reception of the fourth season.