toooonightttt is halloweeeeeen, janettttt! (quick, everyone go get yo' mediaeval baebes on)

Whenever October rolls 'round, I am filled with the overwhelming urge to write many seasonal eerie (or, ya know, silly & shenanigous) Halloween tales -- but then I never actually find the motivation to do it! So this Halloween season, let's make it happen via fic meme!

Comment with a fandom, a pairing/characters/whatever-you-prefer, and a prompt that is somehow Halloween festive, and I will write you an October-y tale!