Everyone Is Missing Something But I Feel Left Out

On my way uptown to my mother's apartment this afternoon, all of these guys started taking off their pants on the R train. I was peacefully listening to Courtney Love and thinking about how much I hate my ex-boyfriend when the first guy removed his pants around canal street, I was shocked, but no one else seemed to notice. Then I looked around me and more and more guys were removing their jeans and getting off the train at the next stop. Then girls started too, I never knew 15 year old girls could have cellulite. I looked out the window at 14th street and at least 15 people standing on the platform were in their underwear. 

I wanted to yell at these people, did they not know it snowing above them? I cannot figure out why these people did this. The only explanation I could get was from a pantless girl, who just shrugged and said "Its New York City". What was going on? Why did I not know what was going on? Was there some massive facebook group or something? I've seen youtube videos of the silent raves in union square and London, could this have been some kind of new performance piece? can someone please tell me what happened? have i just lost it?