The children upstairs are dancing loudly every midnight, so I went upstairs to knock on the door.

The parent opened the door and scolded, "If you find the noise annoying, go live in a villa!"
I said nothing, took out my phone to start recording, and also showed the decibel meter.
"Over the limit every night for a week. Evidence is complete, see you in court tomorrow."
She turned pale and said, "You... you must be crazy?"
I smiled and said, "Being crazy isn't illegal; disturbing the peace is."
Turning around and going downstairs, she shouted from behind, "Is it not okay that I buy a carpet for the kids?"
I looked back and said, "While you're at it, also cover the floor downstairs. The people living upstairs are my parents."
The next day, she really did it. She even sent a box of apples to my house.
A note read: "Brother, I'm sorry."
I replied, "I've accepted the apples, but the apology letter needs a three-month observation period."