Tell me about the most wonderful scene you saw on the subway.

In Barcelona, two vagrants, an old man and a young man, got on the subway, and the boy led a dirty old dog. When the two men sat down on the ground, the teenager began to scrape the dog hair that would never be shaved smoothly with an iron comb, so many dog hairs and strange things parasitic on them fell to the ground. Then, the boy took out a lighter and began to burn these fallen hairs in no hurry. It was the most indescribable smell I had ever smelled, because it smelled of burnt hairs, strange parasites and tramps. The carriage was originally crowded with people, and gradually I hid in the next carriage with my nose covered and my face panicked. I was so sleepy that I always took a nap in the seat opposite the teenager. But later, I found that the whole carriage was left with the dog-burning party, and I quickly woke up and fled. I still smell like that on the subway.