what's your weirdest hyperfixation that you've had?

i've had plenty of weird hyperfixations throughout my life, but the weirdest one i've had and currently have is one that i can't even figure out how or where it began: computer viruses.

for some reason, i have been non-stop watching YouTube videos about the weirdest, scariest and most random types of computer viruses ever known, and doing non-stop research about all of the different ones that exist and the weird or funny things they do to your computer. i legit sat through a half-hour long video going in depth explaining the "you are an idiot" virus and for some reason i was entertained the entire time and now that annoying-ass song is stuck in my head, and i keep singing it.

anyway, what's yours?