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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.
After prodding by Leonard, a reluctant Penny sets Howard with her friend Bernadette, though they find they have little in common.
However, the two bond over their respective relationships with their mothers.
Sheldon, despite never having driven a car before, is forced to drive Penny to the hospital after she slips in the shower.
Leonard, Raj and Howard go on a camping trip to watch the Leonid meteor shower, but all succumb to the effects of "magic" cookies given to them by Deadhead campers nearby, causing them to blurt out weird secrets including Howard losing his virginity to his second cousin.
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.
Penny and Sheldon start a quirky friendship (though she can still annoy him).