Interesting niches you're interested in

Post all the cool interesting niches of the world that you're either into or thinking about being into.

I'll start:

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There's been this series on YouTube, started by one person but then replicated by many others, some good some bad, that involves creating fake bootscreens and startup/shutdown sounds for Windows versions that don't exist. It's called "Windows Never Released," and bad English aside, this kind of thing tickles all of my fancies. Nerdery? Check. Graphic design? Check. Obscureness? Check-a-rooni.

Just take a look at one of the few good WNR videos released relatively recently:


Here's a playlist of made of some more good ones.

I'm also working on a few bootscreens of my own for an upcoming WNR video of mine. Take a look below:

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Spoiler

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But yeah, discuss niches in here. I'm interested to see what you post.