Damn You Magic Jar
I keep including these in The Armory Series because anything outside of the original designs may be used as stretch goals past the addition of stickers, which is close to being crossed with three weeks left.
So I think so far this is my favorite weird thing I have found in my research, just the thought of my soul being trapped in a "jar" while someone runs around in my body does not sound fun. What is your favorite weird item or spell in DND?