Ever dreamt that you've gone to work in nothing more than your pants?
It's a common nightmare – but for 16,000 people around the world, it became a reality.
A host of semi-naked passengers hit travel networks during morning rush hour - including hundreds on the London Underground - as part of the Annual No Trousers Tube Ride. Scroll down to see the video.
The event, part of the larger No Pants Day, was organised by flashmob gang Improv Everywhere, which used Facebook to invite people to take part.
And it's quickly become an international event. It has spread to 60 cities in 27 countries, including Washington DC, Toronto, Mexico City, Madrid and Tel Aviv.
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