A person who accidentally injures a bird, according to unwritten rule, must kneel down in front of its cage. Fortunately, there are special pliers for the job and no one has had to kneel down yet.
要是有人粗手大腳弄傷鳥，不成文的規定﹘﹘到鳥籠邊去跪；所幸有專門用來夾腳環的夾子，還沒有人跪過鳥籠就是。