Unsuspecting Ruan Becker, 20, opens the wheelie bin where his mother Hester Greeff, 41, is hiding dressed as Pennywise from the horror movie It in Johannesburg, South Africa
Ruan throws up his arms and jumps back in terror when he spots the 'killer clown' he has been afraid of since he was nine. His mother hit upon the prank after he refused to make her a coffee
Ruan casually walks to the wheelie bin and opens the lid before suddenly jumping back in terror when he spots the 'killer clown' inside.
He throws his arms in the air and shouts out in shock before dropping the bin lid back down.
Jannie laughs holding the camera as Ruan drops the bag, and dashes back into the house.
Hester used an old fancy dress outfit and make-up to transform herself into the terrifying character
She wore an orange wig and painted her face white before adding the characteristic red nose and smile, which extends above her eyes
The look was completed by wearing a long white gown, adding to the ghostly feel of the character who is defined as a 'cosmic evil' in Stephen King's book
'I absolutely hate clowns, I have been ever since I watched IT when I was nine-years-old.
'I had no idea they had planned anything so it was a complete shock. I didn't see it coming as this is completely out of character for my mum.
Ruan says the prank 'was completely out of character' for his mum and it scared the life out of him
The clip filmed on April 14 has been viewed more than 1.7 million times on Facebook, with some saying they would 'cry their eyes out' if it happened to them
'The first time I watched IT, I had a nightmare the same night. The next time I went to a funfair I was chased by a clown for a joke and I just started screaming.
'I haven't planned anything yet, but I will get my mum back.'
Bill Skarsgård plays Pennywise the clown in the 2017 film adaptation of Stephen King's 1986 horror novel, as well as in the 2019 sequel It Chapter Two
The character first appeared on screen as a 1990 television miniseries featuring Tim Curry in the titular role
Stephen King's 1986 novel It was originally adapted into a television miniseries in 1990, with Tim Curry playing the titular character also known as Pennywise.
The killer clown is described as an ancient cosmic evil who prays on the children of Derry, Maine, every 27 years.
The book was most recently adapted as a 2017 film, featuring Bill Skarsgård in the frightening role, and was given a sequel in 2019, It Chapter Two.