It's not easy running Hell... and from Lucifer's perspective it's not very interesting either. So when the Devil decides to use up a vacation day to get away from the torture and the screams; he certainly isn't thinking about a world shattering apocalyptic event where the dead rise from their graves and infect the living, arguing with Angels, befriending two twenty something slackers, finding God or helping to save the world from the hands of a rogue Fallen Angel bent on taking over Hell and all of Earth.