Now this is something you don't see everyday... On November 8th during the early morning hours (shortly before 5:00 AM), a brawl ensued on an R160 (or R160A) 
train between Broadway-Lafayette and West 4th Street, resulting in four people getting arrested.
Learn more: http://www.nydailynews.com/new-york/subway-slap-sparks-f-train-brawl-article-1.2005151