Larry David created George Costanza as a reflection of himself. So exactly what happens when you get Larry David playing George Costanza playing Larry David?
A complete mindfuck, that's what. This past season of Curb Your Enthusiasm is like watching Back to the Future II where Marty McFly can't run into his future self. Once you start thinking about it your mind starts going in circles, then your head starts to hurt, and it's all over.
With the Seinfeld reunion, this whole season of Curb Your Enthusiasm has been insanely meta, but this may be taking it a bit too far.
Also, last night was also the finale of season 7 on Curb, and a lot of building came to its apex with an actual episode of Seinfeld.