Moment footy legend Billy Brownless gets the shock of his life when he can’t resist pushing a mystery red button in the commentary booth during a game

Geelong great Billy Brownless left his fellow commentators in hysterics after he couldn’t resist pressing a mysterious red button he spotted in the commentary booth at a Melbourne stadium.

Brownless was doing Triple M’s Rush Hour live from Ikon Park for the Charity Shield game between Richmond and Collingwood on Tuesday when he gave in to his impulses and activated an emergency siren at the ground.

The show went smoothly until the football cult hero saw a big red button in the commentary booth.

‘What’s that red thing over there?’ he asked, forcing his co-host Anthony ‘Lehmo’ Lehmann to try to intervene by saying, “Wait, Bill.” Do not touch it.

Fellow commentator Ryan ‘Rabs’ Warren later explained that the button was the ground’s emergency siren.

‘Then why would they put it in front of me? A big red button? Why would they do that, Rabs? Brownless asked.

Warren then explained that if he touches it, the siren will sound on the ground.

‘I bet he won’t!’ Brownless responded.

Warren responded: “We won’t take that bet.”

Before anyone could stop him, Brownless grabbed the button, pressed it, and the commentary team burst into laughter as the siren sounded.

‘It really works!’ Brownless roared. —What is a mermaid doing up here?

Brownless pressed the red button again and sounded the siren for a longer period.

The former Footy Show star is well known for his fun streak and sense of humor among fans of the game.

Last year he posed as an AFL goal referee at Geelong’s Mad Monday celebrations when stars Tom Hawkins and Cameron Guthrie recreated the end of a clash between Sydney and Adelaide in which Ben Keays was denied a goal in controversial circumstances.