I am grateful no one else is in the room with me. In principle, I’ve no problem with my family seeing me cry: but blinking away hot salty tears while watching Ozzy Osbourne? That seems somehow ludicrous. This is, after all, the self-styled prince of darkness, a trickster-like figure – one part devil, one part joker, one part joke.

I thought I knew Ozzy – we all thought we knew him, whether we liked him or not. He was the fresh-faced, charismatic vocalist of Black Sabbath. He was the bloated, crazed, drug-addled artist who bit the head off a dead bat onstage and once tried to strangle his wife. Later in life he was the lovable, bewildered paterfamilias on The Osbournes reality TV series. For some, he was also the artist with a back catalogue on which much of metal still rests.