Spare a thought for the Polish baritone Mariusz Kwiecień, engaged at Dallas Opera to sing Don Giovanni. Sick through much of the rehearsal period, he seemed fine by the dress rehearsal but then missed the opening night.
His understudy Craig Verm scored a career-altering debut in the role.
Mariusz was then faced with singing the rest of the run in the shadow of his triumphant understudy.
Well, what would you do?