The pop-up began when a large glass box appeared in Grand Central's Vanderbilt Hall, containing a replica of the four-seated desk from Lumon's Macrodata Refinement department. Hired actors playing Lumon employees sat at their desks, doing Lumon things (by which I mean, sorting numbers while not having a clue what said numbers mean).

Adam Scott, Britt Lower, Zach Cherry, Patricia Arquette and Tramell Tillman all appeared as their 'Severance' characters for the pop-up. Ben Stiller was on hand for pictures.

The cast of Severance gave New York City's commuters a rush hour they'll never forget. On Tuesday, the cast of the hit Apple TV+ series promoted the show's second season with a live viral stunt at New York City's Grand Central Terminal.