So, what were they thinking when they invited in both Joan Rivers and Darcus Howe?
Darcus had come on to mutter about his latest film, covering his complicated relationship with his son. He was complaining that the director kept on showing people who didn't understand him. Like his first wife. Who said he abandoned their children.
"No white person has ever understood me. Not even her. I say to her why don't you go join the BNP or something?"
At this point, Joan Rivers sighed, "I'm bored with race."
Darcus bristled. Unusually. "You're entitled to be bored with race. I am not."
Oddly, Joan "my parents fled Hitler and Stalin" Rivers just took that.
However, Darcus carried on. Big mistake. "Since 'black' offends Joan-"
"How dare you! How dare you!" she began. "Son of a bitch!" she continued, explaining that perhaps Darcus's relationship with his children would be better if he'd not kept on abandoning their mothers.
Tables were banged. Microphones thudded. Would it be too much for Libby Purves, the glowing Mum of radio?
LIBBY: I really think you should- now... come on you too... Perhaps... Darcus, you'd like to say that you didn't call Joan a racist. And then...
JOAN: That's right. Go on. And then you can talk some more about your stupid film.
LIBBY: Yes, Darcus, let's talk some more about your stu- film.
DARCUS: I don't want to say any more.
JOAN: Quite right.
LIBBY: Then, Joan, let's talk about you.
JOAN: I'm too upset.
LIBBY: Then let's turn to Andrea, and talk about Plant Photography...
Oddly, the other guest on the programme was Jackie Collins, normally a bit spicy for radio. But not today.