The former Black Sabbath frontman's unpredictable spirit wasn’t just limited to interviews, either. Osbourne delighted in showing up where you least expected him, like lending his voice to the Trolls: World Tour cast roster as the gravel-throated King Thrash, proving he could still bring the heavy even in animated form.

The Black Sabbath bassist shared details of Osbourne’s final performance, including how “frail” he had become, in an essay for the Sunday Times. Butler said the iconic rocker needed the assistance of three people while rehearsing and had to sit down while he sang.