You can say "shut up" with a high or low voice but you can only say "do shut up" in a low voice.
@VictorOzols I beg to differ because I just "Maggie Smith'd" that phrase out loud using a high-to-low singsong lilt and it was VERY satisfying. Highly recommended. Definitely gets the job done in style. #DowagerVibes
@Hez exception made for the high-to-low