It's a revenge story for the ages.
When a video-recording motorcyclist saw a man in a van harassing a female cyclist near Tottenham Court Road, he decided to drive up behind and find out what was going on.
As he pulls up, we witness the driver verbally and physically harassing the cyclist, telling her to "shut up, you old dog," and reaching to touch her through the car window.
He then asks if she's on her period, before proceeding to plead for her number and, ultimately, drive away into the distance.
But instead of leaving it at that, the cyclist was in the mood for vengeance.
The camera follows her as she races towards the van man, waiting until he stops to... well, take a look for yourself: