This thread reminded me of a request about 50 years ago to play the Beatles 'Back In The USSR.' We'd never even tried to play it but launched into it anyway. About one minute into it, where we sing 'Back in the US, Back in the US, Back in the USSR' we all suddenly stopped playing. No one knew what came next and we began laughing. Luckily so did the audience. That request being complied with, we moved on.