Oh man, I love this thread. Some of this is familiar to me, some of it is stuff I didn't even know was a thing...but its
so cool to see the variety of things that people are in to!
Here's my contribution to the sickness:
Board Games:
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I always loved board games as a kid, but like most folks it fell off for me as I entered adulthood. When my kids hit the 8-12 range around 2015 I started looking for something the family could do that was away from screens and internet. I was amazed to find that board games had gone through some kind of renaissance, and what is available today is sooooo far beyond Monopoly, Risk and Stratego. Similar to PCF for poker chips, there is an amazing forum and community around board games as well!
Nostalgia and Sci-Fi Collectibles:
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I love sci-fi & anime across the board, but nothing hits the sweet spot like the terrible (but amazing!) 70's and early 80's stuff. I remember rushing home from school to watch this stuff back in the day. Back then if it wasn't related to food in your stomach, clothes on your back or something for education...the want for this kind of stuff was always met with the "Parent Glare". So of course as an adult I just over-indulge the crap outta this stuff now.

<Bonus Points if you can name all the shows>
Knives and EDC:
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My love of pocket knives has led me down the oh-so-evil EDC rabbit hole. I don't collect the expensive stuff, I collect the stuff that simply appeals to me...which usually falls into the "Best bang for your buck" category. Folders, fixed blades, multitools, pens, flashlights, prybars, watches, fidgets, etc etc etc. Not only does the rabbit hole go deep on this one, but there are a ridiculous number of branching rabbit holes of equal if not greater depth.
Danger Will Robinson!!!