Zombies are a real thing, Haitians would use toxins on you to trigger your death response making you genuinely convinced you were dead. That signal is so primal that all of your logical reasoning would be completely overridden with a deeply rooted delusion that you are in fact dead. It’s kind of like how you can spray ants with their death chemical and they will walk as if they’re fatally injured towards the ant graveyard.

EDIT: Here’s one of the videos showing this off