I think this may be the first time I recall The Big Bang Theory having a "previously on" preamble.

Relationship drama abounded during "The Cohabitation Formulation." One of those relationships, fortunately, did yield some laughable moments, while the other I nearly slept through. 

I didn't find much about the Howard/Bernadette story to be that funny. Not that it's really all that shocking, but the more we witness exactly how co-dependent Howard and his mother are, the more uncomfortable it becomes for me. You'd think Bernadette would be sent screaming for the hills. It did manage, though, to serve up a few classic exchanges between Howard and his mother, particularly over fancy sex diseases.

On the other hand, Raj's sister being back in town promised good times for Leonard, but sent Raj into a frenzy trying to forbid (forbade? forbode?) them from having a relationship. Unfortunately, Leonard continues to be the straight man/lame duck of the group, not once uttering a line worthy of a chuckle, but lovable Raj is always good for a laugh, especially when he gets riled up - and works references to his culture into the debate.

The best part about Leonard's forbidden romance, though, was listening to both Sheldon and Amy react to the situations around them. 

I loved how Sheldon was able to take his surprisingly vast knowledge of Hindu traditions and twist it around into a gibe at Leonard, but completely oblivious to how rude it was. This is what I enjoy most about Sheldon's character, that he doesn't realize his complete lack of understanding of social protocols and decorum, yet still comes off endearing to the audience. So much better than when he's belligerently caustic and condescending for no apparent reason.

Amy also shone brightly as she attempted to comfort her "bestie," who was so obviously burying her emotions over Leonard and Priya. Her description of why Priya makes a better mate for Leonard than Penny ("She comes from the culture that literally wrote the book on neat ways to have sex!") , and her giddiness over finding Priya "an absolute delight" made me laugh rather unexpectedly. I think I'm starting to cozy up to Amy a bit.

Everytime Penny is played as a backboard off of which Sheldon or Amy bounce their wacky basketballs of complete social ineptitude, The Big Bang Theory scores a three-pointer.  

Share your thoughts in the comments below, and don't forget to revisit the episode's best quotes:

Amy: Good news! Thanks to you I was able to make a rhesus monkey cry like a disgraced televangelist. | permalink

Amy: I'm regretting my earlier cattiness; she's an absolute delight. | permalink

Amy: You don't have to be strong for me. Now let's talk about Priya that man stealing bitch. | permalink

Sheldon: Just keep in mind should you ever need a slightly apathetic, tertiary friend, I stand at the ready. | permalink

Sheldon: The Hindu code of Manu was very clear in these matters. If the woman's father is not around, the duty of controlling her base desires falls to the closest male member of her family, in this case Raj. The code also states that if she disobeys, she will be reborn in the womb of a jackal and tormented by diseases. If true, that seems like an awfully large gamble, given that the prize is Leonard. | permalink

Jeffrey Kirkpatrick is a TV Fanatic Staff Writer. Follow him on Twitter.