One of Amy's most hilarious moments on "The Big Bang Theory" comes in Season 5, Episode 12, "The Shiny Trinket Maneuver." In the episode, Amy is excited that a paper she wrote is going to be published in a scientific journal. When she tells Sheldon, however, he doesn't share her excitement and basically brushes her off in typical Sheldon fashion. When Amy leaves the room, Penny (Kaley Cuoco) steps in to help, suggesting Sheldon buy Amy some jewelry to make it up to her.
Upon receiving the gift, Amy says angrily, "Jewelry? Seriously?" letting her boyfriend have it. "Sheldon, you are the most shallow, self-centered person I have ever met." Little does she know, there's something much better than jewelry inside the bag, something she's always wanted whether she knew it or not: a tiara.
Deep into her angry rant, she continues, "Do you really think that another transparently manip—" before suddenly breaking off in an entirely different singsong tone, "Oh, it's a tiara! A tiara! I have a tiara!"
Amy staggers over to Penny, begging, "Put it on me" seven times until Penny places it on her head and tells her she looks beautiful. Positively undone by Sheldon's gesture, Amy kisses and clings to him, a move that sets her far apart from the Amy fans meet in her first episode.
