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Alarming video captured the moment a brawl broke out between a Tesla driver and a motorcyclist in the middle of a Pasadena street.

It happened last Friday morning along Fair Oaks Avenue and Holly Street in Old Town Pasadena.

It's unclear what exactly sparked the fight, but the video begins by showing the motorcyclist approach the driver, who was still inside his vehicle.

Though the audio isn't clear enough to hear exactly what the motorcyclist was telling the driver, the driver then gets out. The two men start arguing.

"[The motorcyclist] proceeded to come back and stuck his head in the window," said Charlie Salinas, the man who filmed the fight. "I thought he was talking to his wife, but turns out it was his mother."

Suddenly, the Tesla driver shoves the motorcyclist and a physical fight ensued.

Salinas stepped in to break it up. At that point, the motorcyclist, who is reportedly a delivery driver, was on top of the Tesla driver.