Mr. Giddings

 is a prospective client of McMann & Tate.

To get revenge on Darrin for telling her she is no longer welcome in their home, Serena arrives at his office looking like Samantha, but wearing mod clothes, and acts outrageously. Serena's fresh behavior makes Mr. Giddings think that Darrin has a bad wife and he leaves, refusing to do business with McMann & Tate.