Dr Pepper

From Muppet Wiki

In 2005, a television advertising campaign for Diet Cherry Vanilla Dr Pepper featured a recording of Jim Henson and Frank Oz singing "Mahna Mahna." The commercial featured a couple on a date at a fancy restaurant. The man is proclaiming to have won the lottery and given it to charity. As he talks, his date sips the drink and suddenly the restaurant breaks into a musical number, with all the patrons and servers bobbing their heads to the song.