Unlike KISS, Ozzy had a legitimate reason to call off his retirement plans once he discovered that he was misdiagnosed. But it turns out that MS was not the only misdiagnosis he has received in his lifetime.

The Mirror had this: "I went to the doctor and had an AIDS test and he told me it was positive," Ozzy said. "That was one of the worst days of my life."

But the former Black Sabbath star was granted a reprieve when a second test came back negative. Doctors blamed the mistake on the singer's immune system which had taken a battering from years of booze and drugs.

- The Mirror has more here

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