What is tattooed on Ozzy Osbourne's knees?

Ozzy Osbourne has smiley faces tattooed on his knees.

The Black Sabbath singer became famous not only for heavy metal but also for a collection of unconventional tattoos. The two simple smiley faces on his kneecaps are among his most recognizable pieces of body art, contrasting humorously with his dark, rebellious stage image.

Accounts of the tattoos trace them to Osbourne’s youth in Birmingham, England, including stories that he tattooed them while imprisoned at Winson Green Prison. He has explained that the faces were meant to cheer him up, including when he looked down while sitting on the toilet.

The tattoos are sometimes described as “happy faces,” but “smiley faces” is the usual wording. They should not be confused with the “Ozzy” lettering on his knuckles or the other designs across his arms and torso.