be surrounded by Zombies. Run away. Run inside garden shed. close door. Be alone. Still taking hits as if a zombie was on top of me. punch air, spinning round like a lunatic. Fall unconscious. Be dead.

Also has happened where I've heard zombie aggressive noise, I don't see one but I run inside and close a door. Just as door closes, previously invisible zombies arms can be seen glitching through the door but I was not able to see it before the door closed.