The horse couldn't sing

Two friends are the main characters of this story that speak about a performance in opera.

One of the friends is called Fred. The two, one day, while they were speaking about a opera , Fred asked if he enjoyed the opera because he wanted to go there too.

So when the friend answered saying he didn't watch whole of the opera , Fred said. “Why not ? ” and he replied : “ I couldn't watch the end of the opera because everybody was afraid ! ”

In fact at the end of one action out two suddenly one horse led by the singers , ran around the stage and made confusion, so everybody escaped !

Maybe the horse couldn't sing !