Drummer with the Bonzo Dog Band, “Legs” Larry Smith upstages Elton John at the Royal Command Variety Performance Show in 1972.

Not be the best picture, but still an enjoyable moment, one which was quite risky for Elton to sing a cheerful ditty about a needy teen and his manipulative approach to suicide to the rich and spoilt Royals . And yes, this is still miles better than Coldplay.
 

Bonus: Elton solo of “I Think I’m Going To Kill Myself”, Playhouse Theater, Edinburgh, 1976
 
With thanks to Neil McDonald