You know exactly what's going to happen in the clip below the minute you start watching it.

All the elements are there: the crowd of onlookers, the steep flight of concrete steps, and the policeman in the helmet and the high-vis yellow jacket, who was apparently on hand to demonstrate cycling safety to children. It was only ever going to go one way.

SEE ALSO: Helmet cam footage shows why it never, ever pays to be nice to people

"Police were staging a safe way for kids to go down the stairs on their bikes and the policeman failed miserably," said a man named Derek, who uploaded the clip to Twitter, was quoted as saying in the Daily Record.

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"He took it in good spirits. He was fine, just embarrassed."

This Tweet is currently unavailable. It might be loading or has been removed.

At the time of writing, the poor man's abrupt fall has been retweeted over 1700 times.

Oh dear.

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