8th Century: The pope co-opts the Celts' pagan festival by naming November 1 All Saints' Day. But the night before remains shrouded in the spooky and weird.
Mid-1800s: The Irish, escaping the potato famine, spread their holiday across the United States.
1938: Orson Welles performs The War of the Worlds as a newscast. Best Halloween prank ever.
1978: The first Halloween flick introduces babysitter-killer Michael Meyers.
2007: The world's largest jack-o'-lantern is carved from a 1,689-pound gourd.
2007: Obama masks outpace McCain's mug 55 to 45 percent at BuyCostumes.com. But Palin outsells Biden three to one.
Next: 3 things you should know before you buy a Halloween costume