THIS is the savage moment a moped "menace" was floored with a kung-fu kick to the head just seconds after toppling over the bike.
Footage shows a man trying to move the parked moped from the middle of the road.
He is seen leaning on the heavy moped in a bid to shove it out of the way.
But the moped topples over onto the tarmac - just as a helmeted man comes into view.
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None the wiser, the man in the road gives up and starts walking back to the pavement.
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The helmeted man is seen sprinting over to him - with bystanders heard shouting: "Man on, man on!"
He then springs into the air and launches a kung-fu kick at the other man's back.
The fly kick instantly floors the other man, who is left lying in the road as a car glides past.
Eyewitnesses said the man was trying to start the moped before the bizarre scenes unfolded.
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Cops have praised the bystander's courage but reminded the public to exercise caution in such situations.
A spokesperson said: "While we understand the impulse to protect others' property, we encourage people to call the police rather than putting themselves at risk."
The moped was returned to its owner, who expressed gratitude for the bystander's quick thinking.
Meanwhile, a resurfaced clip shows the moment a man was hit by a bus - before he hopped right up and walked straight into a pub.
Another video shows brazen thieves using a bizarre technique to steal cars from driveways in the middle of the night.
And this is the terrifying moment masked thugs fired a shotgun at staff in a brazen daylight raid - after smashing their way in with axes.