What is the creepiest/strangest thing that has ever happened to you. That you couldn't explain?

I suppose it would have to be when my father had throat cancer years ago. He would go and sit downstairs some nights and if I heard him I would see if he was ok. This particular night I checked on him and he seemed ok. As I went back upstairs I heard this voice, at least I think that’s what it was, saying I had to go back he was going to die. I went back and ten minutes later he did die