 " Michael 's Birthday " originally aired on NBC in the United States on March 30 , 2006 . " Michael 's Birthday " received 4 @.@ 0 / 10 in the ages 18 – 49 demographic in the Nielsen ratings . This means that 4 @.@ 0 percent of all households with an 18- to 49 @-@ year @-@ old living in it watched the episode , and ten percent had their television tuned to the channel at any point . " Michael 's Birthday " was watched by 7 @.@ 8 million viewers . 
