Ho trovato questa vecchia storia di Elvis.

Elvis, occasionally during live performances, would randomly change lyrics to give them humorous connotations. One popular instance was recorded at the International Hotel in Vegas on August 26, 1969. During the performance, instead of singing: “Do you gaze at your doorstep and picture me there”, he sings “Do you gaze at your bald head and wish you had hair”. Moments later, he saw a bald man in the audience (as legend has it), and burst into laughter which continued into the next lines. The audience was treated to additional laughter during the spoken verse singing: “You know someone said that the world’s a stage, and each must play a part.” Seeing the irony of his own lyrics, Elvis was again overtaken by laughter and barely recovered. The audience enjoyed the sincerity of the moment while Elvis regained his composure. Meanwhile the band and backup singers continued to keep the song going. It is speculated that much of Elvis’ mirth derived from the solo backing singer whose falsetto remained resolute throughout. To this, Elvis comes back just in time for the line: “And I had no cause to doubt you” followed by more laughter. So overtaken, Elvis encourages the backup singer to “sing it, baby” drawing even more laughter which nearly brings the house down. In the end, the song is finished to a round of applause. The version is considered to be a popular underground classic, and was a UK Top 30 hit in 1982 after first being commercially released by RCA in the 1980 box set Elvis Aron Presley.
According to Dr. Demento, who plays the version on his show, there is nothing on the label of the recording to indicate that it is anything other than an ordinary recording of the song–“People must have been surprised when they took it home and played it.”
Elvis said at the end, “That’s it, man, fourteen years right down the drain…boy, I’ll tell ya.”