Hahah, who'd thought it. This is the episode when Amy and Sheldon make an impossible game of questions and answers, which the answer is the most absurd thing you can imagine. Leonard says they're making stuff up, and "Shamy" make nice jokes towards him. After that, "Shamy" join to the nerds in the Cheesecake Factory and Amy is very rude and arrogant to everyone around, including Penny (who turns into friends of her in the following episodes). "Shamy" break their relationship, Sheldon gets crazy and make some fun jokes about his new cats, naming them all the famous physicists. A very good episode from a very good season that came to an end, but hopefully will keep it's quality in season five.