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A fan-favorite scene involves Howard and Raj testing Sheldon to see if he is actually a robot, using Isaac Asimov’s Three Laws of Robotics .

To keep the "date" one-on-one, Leonard lies and says the other guys couldn't make it (claiming Sheldon had a colonoscopy). The dinner is filled with awkwardness: Leonard bangs his head on the table while trying to retrieve a dropped olive and later suffers a concussion, ending the night by puking in Penny's car. Fun Facts & Trivia Watch www xrysoi se The Big Bang Theory S01E03 h

Watch Leonard’s hilariously awkward attempt to 'shoot his shot' with Penny in this classic early episode: A fan-favorite scene involves Howard and Raj testing

This episode marks the first appearance of Leslie Winkle , who becomes a recurring rival to Sheldon. Fun Facts & Trivia Watch Leonard’s hilariously awkward

Encouraged by his friends to move on, Leonard asks out his colleague, Dr. Leslie Winkle (guest star Sara Gilbert). Their "date" consists of a clinical "test kiss" in the lab to see if they have chemistry; Leslie concludes there are "no sparks" and moves on.

Johnny Galecki (Leonard) and Sara Gilbert (Leslie) previously played a couple on the sitcom Roseanne .

Leonard is devastated after seeing Penny kissing another man in the hallway.