The motorist reacts by storming back up to the cyclist, grabbing his dashcam and launching it across the road.
It lands perfectly and continues filming as the now-furious cyclist gets off his bike and starts shoving the terrified driver.
"I've just had a bad day," the not-so-tough man can be heard saying.
The biker replies: "You've had a bad day?! You've just f***ed my camera mate."
Quivering with fear, the driver tells him he will cough up the money for a new camera on the spot.
But he later seems to renege on that promise as the cyclist is heard barking, apparently in reply to something the driver said: "Yeah call the cops, I've got the f***ing lot on that video."
It is not clear how the row ended, but Mark posted the video on YouTube and said: "Seems he was angry because I held up his life for 10 seconds taking the left turn.
"[The] camera was able to land on the road divide line and still capture the tough guy running away."
The full identities of the men are not known and it is not clear where the incident took place.