there is a slight chance that could happen
That was the 1665 outbrake which lated until late September 1666.
Possibility that a zombie infection could happen..
Zombie Zombie happened in 1984.
Not scientificaly. There is no proof that there are zombies, so a zombie apocalypse can't happen.
Zombie Wranglers happened in 360.
Zombie Driver happened in 2009.
Fort Zombie happened in 2009.
Zombie Massacre happened in 1998.
Zombie Tycoon happened in 2009.
Zombie ShootAR happened in 2010.
While you are tripping basically anything could happen or you think is happening
No, it is not possible to clone a zombie kitten.