The Human Zoo is a place to learn about the one subject that never fails to fascinate - ourselves. In this episode, morals and norms. Naked tourists on Malaysian mountains? Professional footballers sprawling on the streets of Tenerife? The team turns the lens of psychology on news of bad behaviour.

How do we know about the unwritten rules that govern us? And why does it cause such outrage when we get them wrong? Michael Blastland investigates with resident Zoo psychologist Nick Chater, Professor of Behavioural Science at Warwick University, and roving reporter Timandra Harkness.

Special guests include Richard Holton, Professor of Philosophy at Cambridge University, Digital Human presenter Aleks Krotoski, psychologist Dr Kate Cross, as well as writer and broadcaster Simon Fanshawe on how his mother started a bread roll fight with a Lord.

Presenter: Michael Blastland Producer: Eve Streeter and Dom Byrne A Pier production for BBC Radio 4.