On Halloween day, October 31, 2007, we stumbled upon NBC's 30 Rock shooting their Christmas episode for Season 2.  The episode would later become known as the Ludachristmas episode.

They were shooting on the ice rink at Rockefeller Plaza. We saw Tina Fey, Alec Baldwin, and guest star Andy Richter.  Making the day more fun was having many of the crew dressed up for Halloween. Here are a few photos from set that day.