[s4e10] The Alien Parasite Hypothesis Review

Fans often point out that Sheldon and Amy eat lunch in the lab while Amy is slicing brain tissue—a major violation of safety protocols.

After rejecting Zack's lack of intellect, Amy adopts the Vulcan practice of Kolinahr to purge her emotions. [S4E10] The Alien Parasite Hypothesis

Amy informs Penny that the iconic heart shape is actually based on the shape of a female’s buttocks when bending over. The Alien Parasite Hypothesis | The Big Bang Theory Wiki Fans often point out that Sheldon and Amy

Sheldon proposes several possible causes for Amy’s elevated heart rate, sweaty palms, and "localized vascular throbbing": Ruled out via blood work. [S4E10] The Alien Parasite Hypothesis

Amy attempts to satisfy her urges by approaching Zack, telling him she is "130 pounds of raging estrogen" longing to "make Shakespeare's metaphorical Beast with Two Backs".