The one and only rule
If you own a business, you set whatever rules you want. At this particular karaoke bar, the co-owners unanimously decided that they wouldn’t have any Grease OST songs in their database. One couple wasn’t happy about this and asked the manager whether they could put in Summer Lovin’ just for them.
Things got pretty heated, and the couple asked for the number of the owner (who was standing nearby). When they gave the guy a ring, he told them in no kind terms that everything Grease-related, including the couple’s favorite song, was terrible. No compromises were made that day, and the couple left before their hour was up.