When I was in the library, an embarrassing thing happened with headphones on. Because the library is a very quiet place, and then if I usually listen to songs with headphones, I like to turn the sound up a little. Then I thought I was wearing headphones to amplify the sound so that others could not hear me. Then I didn't expect something embarrassing to happen. I found that many eyes around me were watching. I didn't know what to do then. Then I took off my headphones and found that the voice was so high. Then I said sorry to them.