THE DOCTOR: But you can’t rule the world in hiding. You’ve got to come out on the balcony sometimes and wave a tentacle, if you’ll pardon the expression.

Robert Banks Stewart (1931-2016) Scottish screenwriter, television producer, journalist

Doctor Who (1963), 13×01 “Terror of the Zygons,” Part 4 (1975-09-20)

(Source (Video); dialog verified)

Variants:

• "Well, you can't rule the world in hiding. You've got to come out onto the balcony sometimes and wave a tentacle, if you'll pardon the expression."
• "Well, you can't rule the world in hiding. You've got to come out, onto the balcony sometimes -- and wave a tentacle."
• "You can't rule the world in hiding. You've got to come out on the balcony sometimes and wave a tentacle."