Sheldon recruits Penny to guest on his video
Series 6, Episode The Monster Isolation 17
Howard creates the ultimate gift for Bernadette
Series 6, Episode The Tangible Affection Proof 16
When Sheldon and Leonard argue, Sheldon pulls out the contract.
Series 6, Episode The Spoiler Alert Segmentation 15
Howard and Raj receive their dolls, but the excitement wears off
Series 6, Episode The Cooper/Kripke Inversion 14