In this special ep of "The Big Bang Theory" which aired and takes place on Valentine's Day: Leonard offers to take Penny to dinner, which she accepts. Howard is on Bernadette's bad side because he plays on his X-box instead of doing household chores when she's working. Raj suggests to Stuart to keep his comic shop open for the night in order to invite other unattached lonely singles for a party. And Sheldon uses his assistant Alex to help find a present for Amy. I'll stop there and just say this was another hilarious ep of "The Big Bang Theory" especially with the way the dinner between Leonard & Penny and Howard & Bernadette goes and the way things end up with Sheldon & Amy. Oh, and Raj also gives an inspiring speech near the end. In short, "The Tangible Affection Proof" is another comedy classic. Highly recommended!