Well, I was involved in one that was pretty bad. I had two acquaintances who had a Mexican trio that played romantic boleros, etc. I did a lot of latin music at the time but not the same kind that trios usually do. I went to a festival where they would be playing just to see their act. I was dressed pretty sloppily, it being an outdoor festival and very hot outside. The two of them were onstage and when they spotted me coming up one of them ran down and told me in a panicked whisper that the singer hadn't shown up. He dragged me onstage and before I knew it they had introduced me as "Maria" from Chile. Problem was we didn't have very much of a repertoire in common, so we had to sing the same few songs over and over. I was glad when that was over, and I'm sure the audience was too!