It was, well, cute to see Penny finally take interest in Leonard’s work.  She makes a clear attempt to be interested in Leonard’s experiments.  Leonard shows her a couple cool experiments and it is really one of the first times that we see Penny genuinely appreciate Leonard as a person.  This results in Leonard and Penny not being able to keep their hands off of each other and performing , ahem, “coitis” frequently throughout the episode. Stewart’s Halloween party was a success.  Raj pulled off what appeared to be a rager at a comic book store (is that even possible?).  Sheldon and Amy came to an amusing compromise for their costume.  Amy was Raggedy Anne and Sheldon was Raggedy CP30 (hilarious).  Leonard and Penny went as Albert Einstein and a sexy police officer–Leonard was Einstein, not Penny!  Howard painted himself blue and went as a smurf and Bernadette did the same (is it weird that Bernadette was kinda hot as a smurf?)  I find that Raj’s character is getting a little bit annoying and played out.  The writers should write a new storyline for him to get viewers re-interested.  Maybe Raj and the gang can all go with Raj to India for a show.  I think Raj has earned some sort of happiness, by now.  Either give him a girlfriend like the rest, or make something great happen to him.