Dream:

I was dreaming about zombies (?), strangers and I were trying to fight them off with technology. I can barely remember what happened, but in the second part of the dream (the society was reset and people were alive again), three of them came after us. I tried to kill them, but they wouldn't die. I pushed them over a railing that's three floors up, but they stood back up from the ground and continued to come after me.

It wasn't as scary as it sounds. Damn zombie class.