7-Eleven made the most of that initial licensing deal with ICEE. The company recorded a not-quite-Grammy-worthy song about the Slurpee in the 1970s and dozens of commercials over the years.

Six years later, 7-Eleven bought three of the “Icee” machines and in the late 1960s renamed the beverage the Slurpee. The Icee, now produced by another company, is still popular at movie ...