Dad pranks son with fake car horn buttons

Amusing footage has emerged from Australia of a dad pranking his young son with "invisible horn buttons" in the front of a car.

Self-styled "mad scientist" Jacob Strickling installed an extra horn inside a new car with a secret foot switch to operate the horn hands-free.

In the clip, Jacob picks up his son Samuel, 8, and convinces him that the new car has secret buttons.

Every time Samuel presses something in the car, dad secretly operates the horn with his foot switch.

Samuel finds it hilarious but eventually big sister Mikalah works out what's going on and gives the game away.

The clip was filmed on April 20 in Gosford, New South Wales.