![](http://www.ecns.cn/hd/2020/01/13/9640d89cf11d459ca2ff0bf34b1981cb.jpg)
Participants in the 19th Annual "No Pants Subway Ride" wait to board a train in the subway on January 12, 2020 in New York. The "No Pants Subway Ride" is an annual event started in 2002 by Improv Everywhere in New York, the goal of which is for subway riders to dress in normal winter clothes without pants while keeping a straight face. (Photo/Agencies)
![](http://www.ecns.cn/hd/2020/01/13/af0feceecb694472a50dd7e8f533d8c0.jpg)
Passengers without pants make their way in a subway station during the "No Pants Subway Ride" on January 12, 2020 in Prague. The No Pants Subway Ride is an annual event which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and stay serious.(Photo/Agencies)
![](http://www.ecns.cn/hd/2020/01/13/825d02b510f942a898d200f473e09f34.jpg)
People use an escalator as they take part in the annual "No Trousers On The Tube Day" (No Pants Subway Ride) on the London Underground in central London on January 12, 2020. Starting in 2002 with only seven participants, the day is now marked in over 60 cities around the world. The idea behind "No Pants" is that random passengers board a subway car at separate stops in the middle of winter, without wearing trousers. The participants wear all of the usual winter clothing on their top half such as hats, scarves and gloves and do not acknowledge each other's similar state of undress.(Photo/Agencies)
![](http://www.ecns.cn/hd/2020/01/13/0ca7f959bb5a49e3866f1a1f2135a524.jpg)
Participants in the 19th Annual "No Pants Subway Ride" travel in the subway on January 12, 2020 in New York. The "No Pants Subway Ride" is an annual event started in 2002 by Improv Everywhere in New York, the goal of which is for subway riders to dress in normal winter clothes without pants while keeping a straight face.(Photo/Agencies)
![](http://www.ecns.cn/hd/2020/01/13/602a03c528f44b08975d0a2b19c596d2.jpg)
Participants in the 19th Annual "No Pants Subway Ride" wait to board a train in the subway on January 12, 2020 in New York. The "No Pants Subway Ride" is an annual event started in 2002 by Improv Everywhere in New York, the goal of which is for subway riders to dress in normal winter clothes without pants while keeping a straight face.(Photo/Agencies)
![](http://www.ecns.cn/hd/2020/01/13/960a34b7b77940f5948655b2f6d7d293.jpg)
People without pants stand at a platform during the "No Pants Subway Ride" on January 12, 2020 in Prague. The No Pants Subway Ride is an annual event which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and stay serious.(Photo/Agencies)