Many people across the country have been tuning into The Traitors each week since it returned for its second season at Slane Castle.

The show has quickly become a hot topic of conversation, popping up in friend groups, workplaces and coffee shops alike.

But, why do we enjoy that shared experience of following the same TV show or sporting event as others?

Professor of Psychiatry at Trinity College Dublin, Brendan Kelly, joins Shane and Ciara to explore the psychology behind it...