This hobby is getting weird ....

I just finished listening to a CD through my headset which is plugged into the headphone jack on my integrated amp.
I also have the TV and a tuner connected to the amp. Both were shut off. When the CD was finished I didn't take the headset off right away. Then I could hear very faint voices, then music coming through the headset. Has anyone else ever experienced this, and what is it?
Sounds like you are picking up radio interference. This used to bug me no end.When I got a power conditioner it stoped , no more free radio, had to go out an buy an fm tuner. Sometimes it's the speaker wire /if coiled. I also used to get ham mobile radio guys,as the were passing by in their cars. I live on a busy street.