This episode started out really good, like "rating: 10" status, but then after a while, things just got really... well... weird. I felt like I was watching Two & A Half Men while watching this with Sheldon's constant and unnecessary farting that just annoyed me beyond belief. Also, Sheldon felt a little too over exaggerated here, even though he was really funny at times, especially when he was interacting with Penny.
Just a lot of one liners that just didn't work, like Penny saying "Shut up" to Raj because of his joke, or when Penny said "Then you couldn't talk to yourself" to Raj, like those things I didn't find very funny. And it was quite obvious that something was going to happen in the end to get Sheldon out of the state he was in.
Just an episode that started out superb, just got annoying by the end.