It’s Black Friday! Everyone is camping in the street, staying up all night for the very best deals around. And Unexpected Elements are joining in.

We take a look at the huge underground trade of vital resources...not run by criminals but fungi.

Then it is onto illegal animal trade and the 300 pets who got a terrible deal, strapped to a man’s chest as he tried to make it through airport security.

Have you ever asked a pigeon for advice when gambling? We hear from a professor of psychology about why you should not.

And finally, the story of Lee Sedol, the world’s best player of the board game Go, who was challenged by Google to a game worth one million dollars.

Presenter: Caroline Steel, with Phillys Mwatee and Christine Yohannes Producers: Emily Knight, Harrison Lewis, Imaan Moin and William Hornbrook Sound engineer: Searle Whittney