A viral video shows a frustrated passenger known as ‘Viking Guy’ taking out an unruly drunk shirtless thug with a sleeper choke on the subway.

Adrian Kaczmarek decides he has had enough when a 25-year-old man starts to harass riders at night on an Expo line in Los Angeles.

Other passengers fend him off, one with his bike, as the troublesome man stumbles around the train swearing and walking up to confront people.

Choke-down: A frustrated passenger known as ‘Viking Guy’ takes out an unruly drunk shirtless man with a sleeper choke on the subway.

Drunk and disorderly: Other passengers have to fend him off, one with his bike, on an Expo line in Los Angeles.

Confrontational: The troublesome man stumbles around the train swearing and walking up to confront people

Then in a swift and effective move Adrian, or ‘Viking Guy’, swoops in behind the man with a headlock and chokes him to unconsciousness on the floor of the train, before standing calmly on top of him.

Other travellers express their delight as Adrian keeps his foot on the man’s chest, repeating the phrase ‘stay down’.

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