samaritan.squirrel said:
Complete and instantaneous paralysis. For every human being.
THIS.
Everything else wither and pale in comparison.
Imagine it yourself. Suddenly while out walking, you can't move. Every non-vital muscle in your body seizes up and you are frozen to the spot, only able to see whatever you happened to be looking on at the time. Slowly, slowly your eyes begin to dry up, and you desperately want to blink, but you cant. The world moves on around you, with birds flying around, the wind blowing, and You.Can't.Do.A.Thing.
An itch somewhere, you can't scratch it.
You desperately need to use the loo. You cant move. Your body takes over for you and you soil yourself where you stand. There's nothing you can do about it.
A spider crawls up over your shoe and in under your leg. You can feel it crawling upwards between your skin and the lining of the fabric of your pants. The small legs work slowly, oh so very slowly. Crawling. Everywhere. Nothing is sacred and nothing is saved, it gets into everywhere and you cant do anything to stop it.
Your mind races, panic flows and adrenaline pumps into your mind, but your frozen muscles refuse to obey you. You are completely helpless.
In the distance you see other people, just like you, stuck in their own bodies. You can see the horror in their eyes, and your toughs, unbeknownst to you, mirror theirs.
"I am stuck. I cant move. Someone, Help! Please!"
But no one is coming to your rescue.
A crow lands somewhere nearby you. You can hear the wings flapping about. It peers at you cautiously. Growing bolder by the hours, it finally flies up and lands on your head.
It radiates an aura of cruelty, you can feel it. It hops forwards a few steps, messing with your hair, and then bends down with its head. You see the small black orbs looking at you, and then, as if it was the most natural thing in the world, it plucks your left eye out and flies away.
After one, maybe two days, your mind finally gives up, and you go insane.
After a week, every human is dead or on the brink of death due to lack of food and water, animal attacks or weather.
I will gladly accept any other doomsday scenario. This is the worst of them all. I can't imagine anything more horrible than total and complete paralysis.