Anne the harpist and Sam the trombonist went out to a discotheque.

Sam's car wouldn't lock, but Sam was a good friend of the owner, so they locked their instruments in his office, and went into the disco for some fun.

By the end of the night, and having had way too much to drink, they went back to rehearsal, completely forgetting to take back their instruments.

Anne told the conductor, "I left my harp in Sam's friend's disco."