What is your favorite fandom specific fanfic tag for your fandom?

Any time I wanna have a good laugh or cry, I just scroll through the dead Mike Wheeler tag on ao3. Not just because Mike Wheeler is probably my oldest fandom punching bag that I’m still writing fanfiction for, but the tag is also just so versatile. Half of it is going to be the most soul crushing fanfiction you will ever read, and the other half is going to be glorious crackfic.