Forgot the score

Bad feeling when you go on stage to play concert, put the scores in the front of you, start to play first part, then second. After removing second´s part sheet, you are waiting, that there will be the third part, but there is FOURTH! Damn… you begin quietly to search for the third part, so audience cannot notice the trouble you are in, but the score is gone!
Then you have to play it by memory… Jeesus.
It went perfectly, I played it by memory and also the fourth part by memory. Performance was very good, but I never want to experience something like that again!