While many Ozzfest attendees are likely to remember that Ozzy Osbourne would often cancel the second date of two-night stands citing health issues, the Ozzman was forced to cancel his Sunday night performance in Reno, Nev. due to a "sudden illness."

It's winter and sickness prevails, so we can't fault Osbourne for taking a night off if need be. Concrete details on the "sudden illness" are anyone's guess, but the concert promoter told CNN that it was the former Black Sabbath frontman's medical counsel who advised him to postpone the show. See, even a badass like the Prince of Darkness has to follow doctor's orders.

Watch Ozzy Osbourne's 'Let Me Hear You Scream' Video

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