Quote Originally Posted by Daisy and Delilah
I'm assuming that's really Elvis singing that. Is it Denise? What a pleasure it is to hear him laughing like that. I was in love with Elvis back in the day---wait a minute...I think I still am
Certainly was the King himself - isn't it wonderful? This is one explanation I found:

Are You Lonesome Tonight (Elvis Presley) - Reason for laughing

In the early eighties, a live version was released where Elvis begins to laugh.

Elvis made a habit of not sticking to the lyrics. Normally, Elvis should sing at a certain moment "Do you gaze at your doorstep and picture me there". In this particular version he sings "Do you gaze at your bald head and wish you had hair".

The song continues for a couple of seconds and then Elvis spotted a man that is completely bald.
Hence the laughter.

At the end of the song, Elvis mumbles something like : "Oh God, I have never met this before