The Big Bang Theory Season 2 Episode 13 : The Friendship Algorithm
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Sheldon hears that Barry Kripke (John Ross Bowie) is in control of an open science grid computer, so he plans to befriend him to get access to the computer. Socially inept, Sheldon has trouble understanding how to make a new friend, and his current friends aren't of much help in this respect. During a trip to the bookstore, Sheldon tries making friends with a little girl while Leonard gets him to quickly exit before he is picked up as a pedophile...