That was partly what I didn't get. Why didn't Barney know he was invited? Why would Robin invite him if Barney didn't like him?

Three episodes left for Bob Barker to make a guest appearance. I'm still hoping he turns up at the wedding, makes an off-handed remark to Barney that he knew Loretta in the 70s and 80s, and kickstarts Barney's imagination again.

I used to love this show, but right now I'm struggling to see how it'll last another three seasons. Raj has somehow become an even more one-dimensional character since he started talking to women. Leonard and Penny just have the same argument every episode. There's so few scenes with Howard and Bernadette together…