TOD - The commercials for Hershey's Kisses in which the kisses are figure skating to "The Skater's Waltz" in one and ringing handbells to "We Wish You A Merry Christmas" in the other. The people who designed those put in a lot of detail that made them true to the activities represented.
Also, there was a radio commercial in 1972-73 for United Airlines that started out with a rehearsal piano and a guy's tired voice saying, "OK, girls, we're gonna tap our little hearts out for United Airlines." Then the voice over with the piano and tapping and singing underneath. At the end, the tired guy says, "Higher, girls, higher." And they sing, "Uni-ted Air-lines," an octave higher. I'd time my drive to grad school just to be able to hear that on WJR, Detroit. I think they also had a TV version that wasn't as funny.