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Passengers take part in the No Pants Tube Ride on the London Underground. (Photo by John Stillwell/PA Images via Getty Images)

Passengers take part in the No Pants Tube Ride on the London Underground. (Photo by John Stillwell/PA Images via Getty Images)

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Passengers take part in the No Pants Tube Ride on the London Underground. (Photo by John Stillwell/PA Images via Getty Images)

Passengers take part in the No Pants Tube Ride on the London Underground. (Photo by John Stillwell/PA Images via Getty Images)

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Passengers prepare to take part in the No Pants Tube Ride on the London Underground. (Photo by John Stillwell/PA Images via Getty Images)

Passengers prepare to take part in the No Pants Tube Ride on the London Underground. (Photo by John Stillwell/PA Images via Getty Images)

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Passengers take part in the No Pants Tube Ride on the London Underground. (Photo by John Stillwell/PA Images via Getty Images)

Passengers take part in the No Pants Tube Ride on the London Underground. (Photo by John Stillwell/PA Images via Getty Images)

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The 'No Trusers On The Tube'/ 'No Pants On The Subway' Day on the Bakerloo and Piccadilly lines. (Photo by rune hellestad/Corbis via Getty Images)

The 'No Trusers On The Tube'/ 'No Pants On The Subway' Day on the Bakerloo and Piccadilly lines. (Photo by rune hellestad/Corbis via Getty Images)