[kazinator]

Once upon a time, when I was working at Broadcom, I put on a nice demo for some colleagues.

I had a long serial line strung across my desk from a USB-Serial dongle to an embedded board. It ran under the LCD monitor. Weird banding and noise was showing on the monitor.

The demo was: "watch the artifacts on the monitor go away, as I clamp this ferrite bead around the serial cable".