Card hustlers and street mimes.

Lost drunks and the general river of commuters going two and from Waterloo Station.

But among all this and probably one of the last things you'd expect to see is a long line of particularly naughty shadows cast by the bridge.

Shadows that look a lot like penises.

And it hasn't gone unnoticed.

One social media user said: "In all seriousness, my favourite thing about Westminster Bridge is the shadow penises"

Another user made a rude connection between the shadows and the MPs in the nearby Houses of Parliament.

They said: "Westminster Bridge was specially designed so that the shadows would accurately reflect the public's opinion of the 650 members of the House of Commons."

The shadow is made by sunlight shining through the trefoil design on the bridge's sides.

It's unclear whether this was intentional from the designers or just a good old fashioned balls up.

But at certain points in the day, when the sun is at the perfect angle, you're treated to this strange phenomenon.