Back when I was gainfully employed, I loved to bring all my old receipts into the office so I could shred them on the industrial shredder. You could put in fistfulls of receipts. It was great. That and ordering Post-Its on Staples.com, those were two of the great joys at that job.
But sometimes, I would get a little overzealous, or the shredder would already be full, and it would stop mid-shred. I would press the reverse button, and out would come my AmEx bill, torn into strips halfway up.
It never occurred to me that I could run a shirt through the shredder and sell it.