What’s the last thing you noticed that shouldn’t have been there?

I found a cable in the rack yesterday that wasn’t labeled, didn’t match any diagram, and had no business being where it was. It was just… there. Like a ghost wire. I stared at it for ten minutes wondering if it was a memory of a system that died years ago. Or maybe it’s still alive somewhere, humming silently. What’s the last thing you noticed that felt like it didn’t belong? Not broken—just wrong in a way that makes your skin prickle.