Back in the late 80s or early 90s, a customer logged a fault with an Apple LaserWriter II printer (Canon LBP-SX engine).
"Printer has a paper jam, but there's no paper stuck in it... and please bring a replacement cleaning brush"
The printers came with a tiny little green plastic brush clipped inside for cleaning the corona wire. The brush had somehow passed through the hot fuser rollers and was now 20cm wide and about 0.1mm thick. It had concertinad up behind the little lever that detected a paper jam in the fuser exit area.