Let's talk about ghosts and how I vehemently believe that they aren't real but continue to be part and parcel to basically every culture and faith around the world.
EDIT: I'd like to clarify that in trying to find examples for falsifying the existence of something I spoke about witchcraft and witches being provably non-existent entities by which I was referring to the trope of green-skinned broomstick-flying villains. I want to note that I appreciate the real-world application of witchcraft as being completely valid and apologise for sounding glib.