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Sheldon tries to condition Penny, rewarding with chocolate what he considers to be "correct" behavior.Howard and Raj pretend to be goths to try to meet girls at a goth club, but chicken out when the girls persuade them to get tattoos. Eventually, Sheldon apologises to Raj, conceding that his theory is correct but refusing to give up on his own.Leonard and Penny vacillate between friendship and a romantic relationship, struggling to resolve the awkwardness.
Both are interrupted when Sheldon is humiliated on learning that Leonard, Howard and Raj tampered with one of his experiments, and retreats to his mother's home in Galveston, Texas.
Amy Farrah Fowler in the season finale "The Lunar Excitation".
Christine Baranski submitted the episode "The Maternal Congruence" for consideration due to her nomination for the Primetime Emmy Award for Outstanding Guest Actress in a Comedy Series at the 62nd Primetime Emmy Awards.
Penny and Sheldon start a quirky friendship (though she can still annoy him).
Wil Wheaton begins appearing as Sheldon's arch-enemy. At the end of the season, Sheldon meets Amy Farrah Fowler.
When Leonard refuses to fly kites with Sheldon, upsetting him as he never got to experience a normal childhood, Penny feels bad and allows Leonard to go, especially after pointing out how he is boring everyone at the party.