According to Jim (2001)

S7E11 Pregnancy Brain

Jim discovers he can leverage Cheryl's pregnancy-induced forgetfulness to his benefit. He devises a plan to persuade her that the idea of converting the basement into a media room was originally hers, rather than transforming it into a bedroom for Ruby and Gracie. As he navigates this tricky situation, Jim tries to balance his ambitions with the reality of Cheryl's condition, leading to humorous and unexpected consequences.