It's bad to be unable to hear warnings.
Carrie is walking down a busy city street where people are working in manholes while listening to music on her earbuds.
Carrie wants enjoy her music.
Carrie makes sure to just use one earbud, so she can still hear what is going on around her in the busy city which can be dangerous.
Carrie activates the noise cancelling feature on her earbuds and ignores strangers that are waving at her, so she can focus on listening to her music.
Carrie is able to hear warnings about the open manhole and avoids it to the relief of the people who warned her.
Carrie doesn't hear that the strangers are warning her about an uncovered manhole in her path, and the strangers feel bad when she falls in.