One day I get a call from one of the office secretaries. "The printer is putting paperclips on everything we print" she says. As I sit there thinking about how you would even design a printer that could put paperclips on the print-outs, she says "I'm serious, its putting paperclips on everything, and no, I'm not making this up. Just get up here."
I get in the elevator, and walk to her office, trying to imagine what I was going to find when I got there. I walk in, and she hands me a sheet of paper. "See! a paperclip." At first I don't see anything, but then a glint of light reflects off an indention in the paper. I hold it up to the light, and sure enough, the embossed outline of a paper clip. She shows me a few more pages, all with a paperclip embossed into them. On closer inspection, I notice more than one paperclip per page, and deduce that the spacing between indentations is about the circumference of the printer drum. I pull the cartridge out, lift the cover, and sure enough, a paperclip had made its way into the printer and melted toner had fused it to the drum. We mounted that cartridge on the wall in the IT office, and got the secretary a new cartridge, and a sign warning them not to drop paperclips into the printers...