An awful lot of time has been spent on the relationship between Penny and Leonard Hofstadter throughout the history of The Big Bang Theory and, although they have ended up together all happily ever after, a lot has been made of how they are mismatched and, initially, the idea of Leonard getting with Penny was laughed at by his cohorts. However, the apparently unlikely pair actual spent two years dating each other in real life, up until 2009. They did so in secrecy but, since the break up, they have both spoken about it and have made a point of stating that they still remain good friends off set.
