You know that nightmare in which you head outside for a pleasant day only to realize you forgot to put pants on? Today, that scary dream becomes a hilarious good time when joining the No Pants Subway Ride. Hosted by the merry pranksters of Improv Everywhere, the 12th annual event is always held in the chilly month of January for maximum shock value. Encouraging strength in numbers, the group offers six meeting points from which all participants can head underground together, hop on a train, and—at the stop designated by your team leader—drop trou in unison. Clean underwear is highly recommended.

Sun., Jan. 13, 3 p.m., 2013