[s12e17] The Conference Valuation Now

Leonard realizes his mother, Beverly, performed similar experiments on him throughout his childhood. When he calls her to complain, she reveals that the "experiment" on him never actually ended.

Bernadette eventually fights to keep her, and Penny declines the rival offer, though Bernadette secretly keeps a napkin with Danny's high-salary offer hidden from Penny. The "Guinea Pig" Day [S12E17] The Conference Valuation

Back at home, Howard is left alone with the kids and invites the guys over for company. The day takes a turn when Sheldon finds a book on developmental experiments for children. Leonard realizes his mother

Sheldon and Amy use the children to test cognitive and motor skills, much to Howard's amusement and Leonard's distress. and Penny declines the rival offer

Watch Penny's masterful drug-pushing pitch at the convention: