The #nopantsseattle group is forming. Maybe 200+ people so far.

Today is an event organized by Emerald City Improv. 100s of people
will board Seattle's Light Rail, take off their pants to reveal
sensible underwear, and ride to the airport and back just like any
other rider. The goal is to create a scene of "chaos and joy". The
idea comes from NYC-based Improv Everywhere.