On the afternoon of September 17th 1967, The Doors were in CBS's Studio 50 rehearsing for that night's live performance. Shortly after they finished, and with only about 15 minutes before air, Ed Sullivan came back to The Doors' dressing room and said, "You boys look great, [but] you ought to smile a little more." The comment was a little odd coming from Ed who, of course, was sometimes known as "the great stoneface".
After Ed stopped by, a producer from the show came into The Doors' dressing room. He told the group they needed to change a line in the song, "Light My Fire," specifically the lyric, "Girl, we couldn't get much higher." He explained the word "higher" was inappropriate for a family show on national television because of its association with illegal drug use. Though Jim Morrison was furious and adamant about not changing the song, the group relented and told the executive they would alter the lyrics as requested. However, as soon as the producer left the room, Morrison declared, "We're not changing a word."