Watch: RTE's resident prankster scares the life out of Nicky Byrne, Lottie Ryan and Eoghan McDermott
RTE 2FM 'Crash Test Dummy' Carl Mullan continues his campaign of harassment against his colleagues, with hilarious results.
Armed with a loud speaker, Carl gets up to no good as he runs rampant around the Donnybrook office.
The resident prankster does his best to scare the daylights out of presenters and producers, including Rick O'Shea, Jenny Greene, Nicky Byrne, Eoghan McDermott and Lottie Ryan.
With those early starts, deadlines and long shifts - the station's familiar faces are less than impressed with being snuck up on.
Watch their reactions below.