Sheldon has a revelation when he realizes why a song was stuck in his head. Also, Amy invites Dave over for dinner despite their previously awkward date.
Comedy
More episodes from Season 9
More details
Directors
Mark Cendrowski, Anthony Rich, Nikki Lorre
Cast
Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Mayim Bialik, Melissa Rauch