The Big Bang Theory Episode 7.06 The Romance Resonance

Wolowitz recruits the gang to help him perform a special song he wrote to commemorate the anniversary of his first date with Bernadette. His announcement is so romantic it prompts Leonard to mention to Penny that she doesn't really do romantic stuff for him (which is different from sex stuff). She's disappointed with herself when she's unable to come up with any romantic ideas and apologizes to him by showing him her mementoes of all the romantic things he's done for her. Leonard finds it very romantic that she's kept all those things. Later, Wolowitz's plan goes awry when Bernadette ends up being put in quarantine for the night, but he ends up serenading her in quarantine anyway. Meanwhile, Sheldon discovers a way to synthesize a new element, which is a tremendous scientific accomplishment. Sheldon is thrilled but when he and Amy are in the process of cataloguing all the implements he used to make his discovery to send to the Smithsonian, he realizes he miscalculated in his work and stumbled upon the discovery by accident. Sheldon feels like a total fraud because even though he got the right result, he didn't get there the right way, and he eschews all of the positive praise that comes his way for the discovery.