(You wake up, and it's a bright day outside. Birds singing, sun shining--all that wonderful stuff that makes life worth living. You step outside your door, take in a deep breath...only to notice that the day is not as fabulous as you'd hoped. The world outside is swarming with the living dead, crawling and groaning and attacking the living. With no other recourse, you have no choice but to grab the nearest weapon and defend yourself.

Unfortunately for you, it is only a matter of time before humanity succumbs to the plague...)