Battle of the Duds! Tom Gleeson faces four people foolish enough to have a second try at the Big Brass Mug with their expert subjects of diamonds, social psychology, Novak Djokovic, and the Australian Dung Beetle Project.

Contestants who want to win the Big Brass Mug must answer Tom Gleeson's questions about their expert subjects: The Bible, dog breed Weimaraners, punk band Green Day and classic Aussie film Puberty Blues.