First off, can any one tell me what has happened to Sara Rue? She played Leonard's girlfriend and I don't recall them breaking up.
Besides this little confusion, I really liked this episode, mainly due to Christine Baranski, playing Leonard's mum. The Big Bang Theory must have some great connections as both Christine Baranski and Sara Rue are favourite actresses of mine and to have had them both in TBBT is really amazing. Christine Baranski played Dr. Beverly Hofstadter, and played it really well, getting Sheldon type characteristics down to a tee.
As I have stated before, Sheldon is by far my favourite comedy character on TBBT and to have him and Christine Baranski together and the interaction between the two was priceless. It was a very good piece of writing and acting.
The other big event of this episode was the very close sex escapade of Leonard and Penny. Obviously there is still some connection between the two that we saw in the finale of the previous season and Penny drunk releases her inhibitions to allow this close call, plus the fact she felt sorry for him with his 'hugging machine' and for her own apparent failure at being an actress, so acutely shown by Dr. Beverly Hofstadter. However, I was cringing when Leonard decided to become Freudian during his hopeful attempt at sleeping with Penny, and I was fully behind her when she told him to shut up.
This episode, although maybe showing the connection between the two, Leonard and Penny, it also probably put their chance of dating again a step or two back, due to Leonard's inability to shut his mouth.
Funniest scene has to be the last one with Sheldon convincing Dr. Beverly Hofstadter to partake in some act. Due to it being Sheldon we now deep down that it is not a sexual act but the scene when Leonard walks in to the living room has got to be one of the best so far.
Altogether a great episode, though, for me, mainly due to Christine Baranski and her character, Dr. Beverly Hofstadter.