Directed by: Mark Cendrowski
Written by: Jim Reynolds
Original air date: September 28, 2009
Leonard and Penny vacillate between friendship and a romantic relationship, struggling to resolve the awkwardness. In an attempt to feel comfortable and talk about a solution, they end up getting drunk in her apartment and throwing up all night. Sheldon and Howard stake their most valuable comic books on a bet over the species of a cricket they hear, enlisting a depressed entomologist to settle the bet. After Sheldon loses the bet, he meets Penny and after talking to her about Leonard, assures her that she and Leonard can always go back to being friends. After she explains this to Leonard, the two agree to do so, but they find that neither wants to and have sex again.