'morning!
My favorite commercial was a radio ad for United Airlines. You heard a clunky rehearsal piano and a bored old guy saying, "OK, girls, we're gonna tap our little hearts out for United Airlines." As announcer talked, you heard the tap rehearsal going on in the background. The girls sang "U-ni-ted Airlines," the guy said "Higher, girls, higher," and girls sang in a higher key. They made a TV version, but it was funnier on the radio.
On TV, I like the Hershey's kisses ads, where they're doing something seasonal like figure skating (pairs) or ringing handbells ("We Wish You a Merry Christmas")