In the life of every sitcom there comes an episode where the main characters sit around and talk about things that have happened in the past, usually interspersed with previously aired pieces of video. I've always considered this a bit of a cop out and an excuse for the writers to have an easy day, as a large portion of the show is taken up with old footage. The show needs to have run for a few years and have reason to tell the old stories, so TBBT has reached that time and this is that episode. But in keeping with the writers doing things a little different, the flash backs are imaginings, brought about by Amy's question "Where would we all be without Sheldon?" Each of the main characters has a story to tell, sometimes interrupted by, or corrected by another character, but all off them involving life without Sheldon. Most of them are very funny, self depreciating and insightful. Stuart takes the but of a few jokes, and seems to be becoming the loser of the group. Which is a bit ironic, as when the show started the premise was that the four boys were themselves the outsiders of the community, and for the writers to cast someone as a loser in a bunch of losers seems a tad strange, but it does seem to work. Overall a very funny episode that gives the viewers a better insight into the characters personality.