I have been really impressed with Big Bang as of late, or should I say I have been really impressed with Sheldon as of late. In the beginning of the season, I was doubtful due to Leonard & Penny's relationship, but as long as the writers continue to deliver episodes like these, I really wont have a problem. Sheldon of course stole the show here and the Sheldon & Penny interactions were awesome.
From the power point to him realizing how he got sick, he was just genuinely funny here tonight. Raj was also significantly funny on what he was doing on Valentine's Day. He feels left out ever since Howard started dating Bernadette, nothing new, but it was still funny that Leonard ended up taking Raj in the end. Superb episode.