"As long as you have no intention of defrauding anyone, as long as you don't profit from it, you can just walk away and that's it, " says Frank Ahearn, a privacy consultant in New York City and author of How to Disappear.

BBC: Brenda Heist: How to come back from the dead

How is it possible to make half an estate's taxable value disappear?

FORBES: Partners, But Not With The Irs

He found a 17-year-old paper written by University of Maryland researcher Paul Mazzochi that mentioned how moving a nitrogen atom in a morphine molecule caused its morphinelike properties to disappear--and also made it poisonous, just like nicotine.

FORBES: Tobacco-Free

As I stared out over the landscape I listened to stories about the mysterious forests that grow in the vast shadow of Mount Fuji, and about how people disappear in them.

WSJ: Tom Rob Smith Climbs Mount Fuji | Traveler's Tale