 " Chair Model " first aired on NBC on April 17 , 2008 . The episode received 5 @.@ 8 / 9 percent share in the households demographic in the Nielsen ratings . This means that 5 @.@ 8 percent of all households watched the episode , and nine percent had their televisions tuned to the channel at any point . The episode was watched by 9 @.@ 86 million viewers total , as well as 6 @.@ 49 million viewers in the 18 – 49 demographic . 
