After years of being one of TV's biggest sitcoms, Season 8 of The Big Bang Theory was when everything started to fall apart. The gang was disbanding, relationships began dominating storylines, beloved characters started acting like completely different people, and the "Nerdy" comedy that made the series unique seemed to be fading away completely. And yes...we're also going to talk about Penny's hair. Because as infamous as that haircut became, it wasn't actually the biggest problem with The Big Bang Theory. So what happened?