For many, it would be the stuff of dreams to be invited onstage while Sir Elton sings Saturday Night's Alright For Fighting.
But on Thursday night in Las Vegas, Elton writes on his Instagram page, a concertgoer put his hands on the piano keys while he was playing.
''He continued to do so even after I asked him to stop. He then proceeded to reach over the piano and try to take pictures, completely disrupting the performance.
''I bring fans onstage every evening when we play 'Saturday Night' in the set, it is always a lovely part of the show where I get to meet them, shake their hands and have them right there with me while I play. They have always been very courteous to the fact we are in the middle of playing a song live.
''This guy was rude, disruptive and had no care or respect for our show and so I let him know how I felt, then left the stage until they had removed him.''
It happened mid-way through Elton's performance of the 1973 hit. The fellow also repeatedly tapped the singer on the shoulder and asked for high fives.