The Big Bang Theory Season 9 Episode 4: The 2003 Approximation
5 second plot: Leonard and Penny move in together. Sheldon loses his shit a little bit and decides to act like it's 2003, a time before he met Leonard. Howard and Raj form a band to play in Stuart's store.
5 second review: The singing is definitely not cool. Please. Do. NOT. Do. It. Again. What is happening? Let's get the smart ass lingo and stupid jokes back please.