The Lunar Excitation is the twenty-third episode and season finale of the third season of The Big Bang Theory.
Synopsis[]
Sheldon, Howard, Raj, and Leonard set up an experiment on the roof to bounce a laser off the moon, inviting Penny and her date to join them, leading Penny to realize she can no longer tolerate dim-witted men and dates Leonard. In addition, Howard and Raj find a love interest for Sheldon.
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