I do, on and off. It's always been in Sci-Fi/Horror or Historical fiction themes. For me it is not really to produce a finished product but to imagine exeriencing things I could not in RL. A little like a Holodeck. It can also be cathartic. For instance I had retained anger towards some co-workers at my last job. So I had them eaten by giant mutant crabs.
That's hiliarious, Tom!
Humour is so cathartic, isn't it? I can really relate to this.
I spent a couple of years on a music forum, on an alternative band. It was a bit dire and I was mostly there to write material, so I stuck out like a sore thumb. There wasn't much interaction, which made it a bit freaky - just once in a blue moon, and that was kind of the culture of that place, being like kids in a sandpit saying things out loud in each other's presence without actually engaging significantly with each other's ideas, let alone on a human level as people.
(Whereas here, people regularly engage on both those levels - just as had happened in a good general forum I was with for a long time.)
But I did get to observe the kind of fandom I just wasn't - when people put their favourite bands on pedestals, like people do with cult leaders, and then they go about making dogmas about it all, like the "best" album is this and that and if you don't agree, or talk about "I prefer ABC for reasons XYZ but it's all pretty subjective" or you disagree with people constantly knocking a band member who wasn't in the original line-up and saying nasty things about him and his musical ability (which was so ridiculous and rude), you clearly aren't "with it" and then you get hostility from people in those closed mindsets.
At one point, a band member made a probably kneejerk social media post about feeling betrayed and leaving the band, and this caused such an outpouring of baseless speculation and existential woe from a section of the fan base I really was flabbergasted, but of course it is quite typical for people to be like this about celebrities. I thought, "Well, this is a human being, he probably had a painful disagreement with someone which they've not yet come back to sort because these things take time, and really, whether or not he continues in the band is about his own future happiness and life goals and the public actually don't own celebrities so why do they act as if they do?"
But on and on it went, and people were bombarding the social media accounts of band members and their connections with demands for explanations, venting, etc etc. To no response - the band member in question deleted their account, and eventually appeared to privately resolve his issue with another person/persons, as it ought to be, and eventually someone non-random asked him if he was still in the band and he was like, "Yeah, of course."
And I thought, "What is it about so many people, that when something like this happens they can't just step back and give people in the public eye privacy and space to sort out their personal stuff, and let whatever is going to happen, happen?"
Anyway, because immersed in all this silly furore at the time which went on for weeks, what I did is to write a little sci-fi spoof explaining the situation in terms of space aliens invading earth because they were getting impatient about the time it took for their favourite band to make their new album, so they wanted to prod them a bit and messed impishly with a social media account. It became a six-part modern fairytale with secret excursions into each band member's home to create a bit of mischief and to try out various instruments (octopod aliens, instruments built for hominids
), and a de-briefing session at the end about the ethics of it all and what they might have done differently, and how they could make amends for some of their failings. It was great fun to write and all the laughter was very good for my endorphin levels!