Judgment Day: Five Businesses Hoping to Reap the Rewards of the Rapture

"I'm going to have to close our tabs at 11:30 p.m. tomorrow night just in case people start disappearing," O'Neill joked. "I guess only the good ones are going. All my friends will still be here."

In Atlanta, the Via Restaurant is hosting The End of the World Party tonight and operating partner Derrick Silvera says he too anticipates an increase in business.

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"It's a good excuse to throw a party," Silvera said. "We've been telling people to park wherever you want because your car won't be there when the party is over."

5. "Left Behind" Book Series

Jerry Jenkins, the writer behind the Left Behind series of books about the apocalypse, said he has a growing number of media requests regarding the May 21 campaign, although he is not aware of a respective increase in sales.

Jenkins worked with the pastor, Tim LaHaye, for the series' 16 books, which have sold more than 63 million copies, the first published in 1995. Jenkins said the books have been re-released this year with new covers and updated words related to technology in the series. He said the re-release was planned last year and related to the series' 15th anniversary, not the May 21 campaign.