Joke Labs

A guy playing trombone in the opera had a fantastic gig on the day he had to play in the opera. He tried to find a replacement but without success. Finally he went to his housekeeper and convinced him to do the replacement. "I give you my other trombone. You just look what is the guy next to you doing and it would be OK".

Next morning he asked the housekeeper how it was.

"Catastrophe. Your colleague sent also his housekeeper to replace him".