Joke Collection Website - Cold jokes - Why do we generally have pianos and mailboxes?

Why do we generally have pianos and mailboxes?

The piano and the mailbox are a joke, with a bit of a yin and yang meaning.

Because there are several demons living in the piano and several demons living in the mailbox, it is a homophonic joke.

From the opening song of the 82 edition of Journey to the West, the road to the sky is wide and wide. Just after catching a few demons, several more demons were subdued. Why are there so many demons and demons?

By comparing it with the original lyrics, it is not difficult to see that this is a homophonic joke. The homophony of piano has just been captured, and the homophony of mailbox has dropped again.