I've fought an extra-dimensional predator of some sort multiple times.
The other two aren't nearly as interesting as this one. Story time, please.
Ok, I'm not certain what it is but extra-dimensional predator is my best theory.
Since I was about 12 I've had several encounters with this thing. Basically I feel as if I'm being watched or stalked from every direction and then It takes a physical form and attacks me. It can only physically harm me and I can only harm it in it's physical form, but it seems to be capable of fear inducement just by being present.
The reason I think it's not native to our dimension is because when I look at it I can't tell what it looks like or how big it is, only that it's there. It also moves in directions that shouldn't exist in our world. If you've ever read Lovecraft, that should give you a basic idea of what I'm talking about. It's an alien in the most literal sense of the word, it doesn't even follow most of the rules of our universe.
Luckily I can feel when it's nearby and it doesn't seem to be much of a match for me unless it can ambush me. I still worry about it getting me while I'm sleeping, even though feeling it usually wakes me up. I'm hoping I can kill it somehow.
I'm not trying to get people upset. I'm merely stating the facts: under atheism, life is utterly meaningless. If life is utterly meaningless, then how can any individual activity have meaning? It doesn't. Atheists pretend their activities have meaning because if they don't, they'd go absolutely crazy and be hopelessly depressed from day to day.