It's not on the same scale as hearing voices, but when I was young (5-10 years old) I remember occasionally being otherwise calm but overcome by what I can only describe as a bit of a bad auditory trip. I would be speaking casually with my older sister in the car, for example, and the voices on the radio would become distinctly sinister for a while (30sec) although the content itself wouldn't change.

I remember being able to recognize the feeling when it was coming on and actually slightly enjoying the moment as I knew it would pass soon enough. I'd talk to her about it at the time and let her know when it was happening - just to share the moment rather than anything else.

It never scared me, but I wonder if anyone is aware of if it's something that has a name and is known to happen from time to time in otherwise stress-free and healthy children?

It stopped completely well before I entered my teens.

The best way to describe it would probably be the auditory effects of strong marijuana for someone who doesn't smoke much, but without any of the clouded thinking or stoned-ness