You might have spotted some unusual passengers on the tube yesterday, because it was the eighth annual No Trousers on the Tube Ride, with brave travellers going bare legged across the London Underground network.
The only requirements for taking part are a) you're willing to take your trousers off on the tube, and b) you can keep a straight face doing it.
The event is celebrated in more than 60 countries worldwide. Here are some of the best pics of pantless Londoners from this year's event.
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