5. "It's A Tiara!" http://www.youtube.com/watch?v=8i_WpYc3YI4 Sheldon and Amy's relationship can hardly be described as "ordinary", mostly because of Sheldon's cold, harsh reluctance and total lack of social graces. It is perhaps of little surprise then when he completely dismisses Amy's proud accomplishment of having her work appear on the front cover of a prestigious science journal. Amy understandably storms off in a huff leaving Sheldon to confide in Leonard as to what he should do to make it up to her, to which his fellow geek suggests he buy her a gift. With a little help from Penny, Sheldon arrives at the conclusion that the only suitable gift he could buy for Amy is... a diamond tiara, of course. After being coerced into a meeting with Sheldon, Amy is at first insulted and accuses her half-boyfriend of being shallow that he would even think a gift would be enough to abate her ill-feelings, but is immediately disarmed when she sees what Sheldon has in store for her. Along with being one of the most humorous moments in the show, it is also a touching one as the relationship of "Shamy" reaches a heart-felt new level of intimacy.