By day she's a Christchurch-based psychiatrist. But by night, she can be found on the comedy circuit. Dr Joanna Prendergast was a late-comer to comedy, taking it up at the age of 48 and performing under her stage name of "Jo Ghastly". It's acted as a foil to the seriousness of working in the field of mental health. While she avoids jokes about mental wellbeing, her experience as mum to two teenagers has given her plenty of fodder for the show she's been touring called 'The Cool Mum'. It's just been confirmed for the New Zealand Fringe Festival, which will be held in Wellington in March.