Hundreds of Mexico City residents left their trousers at home on Sunday (January 13) to participate in the annual "No Pants Subway Ride."
Commuters without pants evoked glances, laughter and some disapproving stares as they stood among other passengers in one of the world's busiest subway systems. The yearly event has become popular in cities around the world.
"I like that you can be, I love being like this (without pants) and now I can leave like this onto the street and in the metro no one says anything. It's a bit strange," said commuter Diego Castaneda.
In Mexico, some passengers seemed to respond negatively to the occasion, while others greeted the trouser-less crowds with giggles and grins.
"No, not with my family. I didn't take off (my pants) but it is how they express (themselves). Whatever suits them but it does not make me uncomfortable," said commuter Lilian Diaz.
For some commuters not wearing pants, Mexico City's third annual "No Pants Subway Ride" was a chance to challenge social traditions in the country with strong Catholic traditions.
"It's a little to break the taboo in society. Many people, for example, look to joke with people and break routines but still there are people who are frightened and say no they won't do it when it is normal, you should not have a problem with this," said commuter Eduardo Vlas.
The "No Pants Subway Ride" is now billed as a world-wide annual event, starting in 2001 in New York. Organisers say thousands of people registered on Facebook and scores of commuters took off their pants in more than 50 cities this year.