I remember a few years ago at my high school a teacher who had an odd power strip. This thing didin't have sockets like a normal strip, but instead it had two long, semi-open slats. With this, you could push (ungrounded) plugs into each slot. You could, potentially, pull the plug back and forth along the device, kinda like a bus-bar. Anyhoo, has anyone ever seen these? It "smelled" rather odd to me, and I even questioned if a device like that would be UL approved.