GFedrizzi - the horse could not sing 

The horse could not sing

A man asked to his friend how was the opera he had seen the previous nigtht. The friend answered that he had seen only half of it and so he hadn’t enjoyed. When the man asked why he had seen only a part of the opera, his friend sayed that all the people had left the theatre because one of the horse had to take part in the performance jumped off the stage and everybody was afraid. At that point the man sayed that probably the horse could not sing!