A trouble ticket we once received
Customer Statement: I have something for different for you
Actions Taken: In the back of the computer there is a blue line that plugs into the wall. The light flashes and then there is talking (voices). States they’ve been hearing this for a while but finally realized where the voices are coming from.
Best we could ever figure out, they had a tab/web page open with a video or audio feed. When they unplugged the "blue line" (ethernet in our organization), the voices stopped.