Gimme a Break! (1981) : 5x14

Nell decides to quit college and pursue a real singing career. She becomes the manager for an ex-con who wrote a song in jail and decides to put it to music. When Nell and the ex-con go to Skipper Dwane's for amature night to perform the song, Gary Collins is there, and Nell asks him if he liked the song. Gary says he hated it when the ex-con sang it, but when Nell signs it, he insists that he put Nell on his hour magazine show. When Nell goes backstage to tell the ex-con how he did, she freaks when he has a string of floss out and thinks he is going to kill her. She tells him that she thinks he is going to kill him because Gary hated his song.