Easter Sunday is the day that Christians celebrate the world's most famous zombie, Jesus Christ. Traditionally, they celebrate this day by stealing traditions from pagans, hiding things from children, and then fattening those same children up on candy. There's also something about a rabbit.
It's a well known fact that Zombie Christ, like all zombies, hates the living and wants to feast on your flesh. So, be careful. (I must admit to being a little confused about why so many people are looking forward to his return. He doesn't sound very nice.)