The Lunar Excitation

Summary
The guys set up an experiment on the building's roof to bounce a laser off the moon and back to Earth. Leonard thinks Penny might enjoy that, so he goes to get her, only to find she has male company. Penny and her date accompany them to the roof to observe the experiment. However, in the course of doing so, Penny's date demonstrates himself to be extraordinarily dim witted. Later that night, Penny gets drunk and sleeps with Leonard but realizes it was a mistake the next morning. Leonard goes to ask Leslie Winkle to do the same, but gets turned down. After getting drunk, Leonard visits Penny's apartment and asks to sleep with her, which she declines, leaving Leonard confused.

Meanwhile, Howard and Raj submit an online dating site profile for Sheldon that surprisingly results a match. Sheldon believes dating sites to be "hokum," and refuses to meet the woman the site found for him. After Raj and Howard blackmail Sheldon by hiding a dirty sock (an acute fear of his) in his room, they meet his match, Amy Farrah Fowler (Mayim Bialik). She acts almost exactly like Sheldon, who asks to buy her a drink. Afterwards, Howard comments "Good God, what have we done?"

Title Reference: The guys bouncing a laser off the reflector left on the moon by the crew of Apollo 11 and the excitement about completing the experiment.

-There is a possibility howard purchased a new laptop because in previous episodes he is seen with an Alienware M5550 but in this episode he is seen with a black Alienware M17x