The Big Bang Theory is coming to a close after 12 years this spring, and fans have been waiting exactly that long for one fact to be revealed! Ever since the first episode of the show, "Penny's" (Kaley Cuoco) last name has never been mentioned, not even when she took "Leonard Hofstadter's" (Johnny Galecki) name after they got married. And that is not the only mystery, that might or might not be revealed until the show goes off the air. Like the fact that "Leonard" and "Penny" might be expecting...?

Will the elevator on The Big Theory ever be fixed?

Find out all about it in our video!