Back in June of 2003, NBC premiered a new reality competition for stand-up comedians called Last Comic Standing. The series ran for two summer seasons and then NBC seemed to get a little greedy. Rather than wait a year between cycles, they began season three in August 2004, just weeks after the end of season two. That led the series to be cancelled due to poor ratings.
The peacock network brought it back in May of 2006 and that summer run was successful enough to spawn season five in 2007, followed by season six in 2008. The TV show run out of gas once again so NBC cancelled it for the second time.