I remember seeing and acoustic coupler used for the first time in, I believe, Mission Impossible. Ethan Hunt takes out an adhesive pad and sticks it to a paypho

I remember seeing and acoustic coupler used for the first time in, I believe, Mission Impossible. Ethan Hunt takes out an adhesive pad and sticks it to a payphone and "dials in" to a mainframe or something. Seemed incredible at the time!