A cool video has emerged of father and science teacher Jacob Strickling putting up a home-made 'dunking-chairs'.

In the video, shot near Sydney, Australia on Sunday, Jacob throws balls at targets which causes a nail to burst balloons held above his children's head.

"The story behind the carnival activity has been years in the making. Jacob has been the 'Carnival Master' at his local church every year for the past 7 years," he wrote.

"The kids love the activities he has built eg dunking chairs, skill testers, ring toss etc".