Darn! I was hoping that Penny's brother would be showing up. I got a kick out of him when Penny's family came for the wedding recreation. The show revolves around a machine that can detect emotions and it's in Sheldon's hands. The other plot line has Raj inviting his former girlfriends over to tell why they broke up with him. The possibilities are endless and the writers do nothing with it.
Review of The Emotion Detection Automation
