Well, so long as no idiot goes off and mutates the rabies virus(though I'm sure 20 people will try for lulz after reading this), we shouldn't have to worry about zombies. Aliens and sentient robots, that's a different story.
*Comes back... sees Redeads everywhere... screams... the Redeads screams too... Reddo gets paralyzed... Reddo plays the Sun's Song. Redeads get paralyzed... Reddo pwns them all.*