San Francisco man has argument with driverless car - whose electronic voice issues eerie response to his erratic behavior

A laughing hooligan blocked a driveless car while taunting it, then allegedly attacked a disabled man who filmed his bizarre antics.

Police are hunting the young man in a backwards cap after the bystander he's accused of attacking almost died from a fractured skull.

Bizarre footage shows the man, aged 25 to 30, trash talking the Waymo vehicle in the Pacific Heights neighborhood of San Francisco about 1am on July 5.

He stood in front of the white car in the middle of the road, preventing it from moving as the artificial intelligence refused to risk running him over.

A laughing hooligan blocked a driveless car while taunting it, then allegedly attacked a disabled man who filmed his bizarre antics

'What are you going to do? I want to see it, come on Waymo, give me something to work with,' he shouted at the car, despite it being a car.

The video, released by police, skipped to the man having walked right up to the car's hood and harassing the passenger.

'Yo, the dude in the car, his testosterone is through the roof,' he taunted.

Another part of the video showed him banging on the car's hood and shouting, 'Hey, come on, let’s work for each other'.

The car responded 'unsafe behavior detected' in a robotic voice, along with an alarm sound.

'You're no better than me,' the young man yelled in response.

He stood in front of the white car in the middle of the road, preventing it from moving as the artificial intelligence refused to risk running him over

The video, released by police, skipped to the man having walked right up to the car's hood and harassing the passenger

The man then looked right at the can and gestured disapprovingly, like the car was a person he was upset with.

'Come on we're friends, Waymo, we're f**king friends, you told me you were going to f**king work for me,' he said.

The video ends there, but police alleged at some point the man filming told him to knock it off and let the car go on its way.

Instead, he 'moves away from the car and lunges at the victim, causing the victim to fall', police alleged.

The man allegedly pushed the disabled man a second time, knocking him to the ground, then viscously attacked him as he lay there.

Another part of the video showed him banging on the car's hood and shouting, 'Hey, come on, let’s work for each other'

The man allegedly pushed the disabled man, knocking him to the ground, then viscously attacked him as he lay there

A witness flagged down a police car and officers found the man unconscious with life-threatening injuries, including a fractured skull.

Paramedics rushed to the scene to treat him, and he was taken to hospital.

The victim's family said he was cognitively impaired and police described him as 'visibly disabled'.

Police described the alleged attacker having as medium complexion with facial hair. 

He was last seen wearing a dark backward baseball cap, black jacket, blue shirt, light blue jeans, white sneakers, and carrying a white bag.