This memory comes from when I was working at International Wool. I was curious (I'm a devil for curiosity) about how everyone else's salaries compared to mine. But the culture was, you don't tell people your salary.
Each month, we'd get a wages slip, in a sealed envelope. It was printed, inside the envelope, but some printer, and there was a dazzle pattern on the outside so you couldn't see what was inside.
One month, I examined mine carefully, and I saw that if you tore the envelope open and looked at the inside, you could see my salary.
You can probably guess the rest.
I stayed a bit late one evening, on the day that the salary slips came round. I harvested all the ones I could find (which was pretty much all of them) from the wastepaper bins in everyone's office. I tore them open, looked in side, and made myself a handy database of what everyone was paid. THis meant that for a long time to come, I knew whether my boss was telling the truth or not when he told me how well I was being paid.