Fancast was on the set for the latest episode of The Big Bang Theory. Titled "The Peanut Reaction," it goes into what happens when Penny learns that Leonard doesn't celebrate birthdays and attempts to throw him a surprise party. It takes less than 20 minutes to watch this comedic brilliance here, and then also check out these exclusive behind-the-scenes photos from the show. You won't see them anyplace else other than Fancast.
