Weirdest/most unique special interests?

At one point I had a special interest in Cults 

for a good few months i got fixated on french gothic architecture, but specifically rib vaulted ceilings. i could spend all day looking at.. a ceiling lol

One of my special interests is bones. Just any kind (human/animal) I really like learning about them and collecting them(only the animal ones). I have some jewelry made of them, plus a couple deer antlers and i really want to keep collecting.

it's not really weird or rare but it's the game DND. i have this big obsession and it's been onlly a few month.