When The Big Bang Theory first premiered in 2007 there was no way of telling just how big of a show it was going to become. Now, nearly twelve seasons later the show is wrapping up and millions of loyal fans have been around for the entire wild ride. There is no doubt that a lot has happened in those seasons as the lives of Sheldon, Amy, Leonard, Penny, Howard, Bernadette and Raj have changed. From the addition of new characters to weddings, babies and more, find out how well you really remember everything that went down by matching the event to the season it happened in!