28 Days Later. The CDC investigates infectious diseases, and they also want people to be prepared for any disease outbreak.
Which would you rather prepare for:
- Bird Flu
- Mad Cow Disease
- Swine Flu
- Zombie Apocalypse
So, the CDC put out a bulletin encouraging everyone to be ready for a Zombie Apocalypse, with reminders that if you're ready for a Zombie Apocalypse, you're also ready for other emergencies and disasters.
Better safe than sorry.