Amusing footage of a father accidentally hitting his son with a box when trying to break it over a friend wearing a helmet.

The video, captured at a home in Temecula on December 26 2016, shows the man repeatedly throwing a box to his friend's head, who's wearing a motorcycle helmet.

The third time is when things get wrong as the box ricochets and hits the man's son in the face.

The toddler then burst into tears as his father tries to comfort him in his arms.

The father later wrote online:

'It took me a second to realize what had happened.''

''My son was fine, just a little bruised right above his eye but definitely a Christmas I will never forget,'' he added.

It was the day after Christmas and we just finished opening presents.

I had the bright idea for my friend to put my motorcycle helmet on so I could hit him in the face with a box.

Well, the first time nothing went wrong: he didn’t feel anything.

The box ricocheted into my son’s face and hit him fast. It took me a second to realize what had happened. He was fine, just a little bruised right above his eye. But definitely a Christmas I will never forget!