 The sitcom "3rd Rock from the Sun" showed a two-part episode, "Nightmare On Dick Street", where several of the characters' dreams are shown in 3D.The episode cued its viewers to put on their 3D glasses (which used the Pulfrich effect) by including "3D on" and "3D off" icons in the corner of the screen as a way to alert them as to when the 3D sequences would start and finish.Customers were given free glasses courtesy of a joint venture between Little Caesars pizza and Barq's Root Beer.