Andy Kaufman
While Andy's Kaufman's cause of death seemed totally legitimate, people didn't believe he was gone for good. Kaufman was diagnosed with a rare form of lung cancer and died in 1984 after attempting to remedy his illness holistically. However, Kaufman's friends allegedly claimed that Kaufman said he would fake his death and return 20 years later. If this were true, he should have shown up in 2004—but everyone is still waiting.
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