My biggest fears on high-speed trains are three types:

1. Kids crying and screaming nonstop, with adults repeatedly soothing them like a tape recorder.
2. Loudspeakers playing often low-quality, vulgar short videos with music.
3. People constantly making phone calls.
During this Qingming holiday trip, I encountered all three. I was too lazy to say anything, but luckily, the train attendant also couldn't stand it and went to intervene. But after a while, it started again...