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Leonard is dreading a visit from his mother, famed scientific psychoanalyst Beverly Hofstadter. She has always driven Leonard crazy, much like Sheldon does now. It isn't surprising as Beverly and Sheldon are very much alike. Because of their similarities, Sheldon and Beverly hit it off. Beverly, however, extends her scientific psychoanalytical criticisms toward Howard, Raj and Penny, in addition to her son, the latter two who are driven to drink. In drowning their self-doubt in alcohol, Leonard and Penny have a special connection. Sheldon and Beverly also contemplate having a special connection.