Interestingly enough, "Andy Kaufman" came forward on the 20th anniversary of his death and claimed he was still alive. DNA confirmed it was him. He got in contact with old friends and families. His mother said it's nice to have him back. Andy said if he ever died he'd return on the 20th anniversary of his death (May 16th I believe) and so he did!
The problem is that his mother is dead, and it turns out the news article that Yahoo posted about the DNA tests was taken from a tabloid newspaper.
It's all total bull. Check out andykaufmanhoax.blogspot.com - there's more proof there.