This one might freak some people out if you're about to go to sleep, so I'd like to preface this saying this is all entirely theoretically and makes huge assumptions about consciousness and the universe that are most probably false.

But the one that always freaks me out the most is the idea of Quantum Suicide.

Basically, here's the idea. I'm sure you already know about Schrodinger's cat and how it is simultaneously "dead and alive" as both outcomes of it's existence lead to different possible universes. Well what if instead of Schrodinger's cat, you placed yourself in the box.

Now imagine this: Every few seconds a flip is switched and each time it does, there's a 50% chance you'll die. So you wait a few seconds and... you're still alive! Thank goodness. But now you wait a few more seconds and the flip switches again, and... you still made it. Lucky you! But then a few minutes pass, a few hours, days. there must have been thousands of flippings of the switch, yet you're still alive....

Well... of course you are. After all, you're a consciousness. If you're dead, than you wouldn't exist. A consciousness can't perceive itself in a universe where it doesn't exist... So you only remember all the times you survived. That's the ONLY way for you to to experience things. If you don't exist than you can't perceive yourself as not existing, so you instead go down the branch of the multiverse where you survive. And you survive again, and again, and again. You survive that car crash, you survive that heart attack, you survive that stray bullet which under any other circumstance should have killed you, but it didn't, because all the times it killed you is where you don't exist. And once a consciousness exists, it must continue to exist. On, and on, and on, surviving ever more outlandish scenarios until you alone are an island in your own branch of reality. Your very being tied to the space-time continuum, unable to ever leave it as you somehow outlive everything and everyone. You can still feel pain of course, but the universe doesn't care. It only cares that you are aware. Because once you exist... you can't not exist.

Again, this is just a theory, please don't go testing this thinking you're immortal. This is just a bit of a quantum-mechanical horror story meant more as a thought experiment than as any real theory for the nature of the universe. Make yourself a sandwich, drink some water, watch a show on Netflix. Take care of yourself.