When Leonard’s mother, Beverly, comes for a visit, a normal week for the guys and Penny takes a much unexpected turn; Beverly is a neuroscientist who talks to Penny about her problems (making Penny cry like a little girl), Leonard becomes so tired he spends much time in Penny’s apartment (in Penny’s bed… with Penny), Sheldon finds an unusually comfortable person in Beverly, and she believes Rajesh and Howard are in a homosexual sex-relationship.