Video shows why you should always leave your handbrake on when parked

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This is the hilarious moment a hapless motorist forgot to put his car's handbrake on and was forced to watch as it took off down a grassy hill.

The unidentified man can be seen getting out of the silver Peugeot at the top of a hill in a seemingly empty field.

As soon as he closes the door, however, the car rolls down the slope, leaving the clearly stunned man with nothing to do other than watch.

His friends, who are somewhere off camera, are by no means sympathetic towards him and can be heard bursting out into fits of laughter as the car reaches the other side of the field and disappears into a row of bushes.

The driver doesn't appear to be too upset, though, and can be seen with a smile on his face at the end of the video.

It is unclear whether or not he was able to retrieve the Peugeot following the incident, or where it actually took place.