In 1967, while I was in school, I reverse-engineered the Montreal Metro system transfer tickets. It used a custom paper tape-type punched code. I was able to ma

In 1967, while I was in school, I reverse-engineered the Montreal Metro system transfer tickets. It used a custom paper tape-type punched code. I was able to manufacture tickets. Was real popular with my classmates. In 1983 I reverse-engineered the Xerox 9700 laser printer font format. Xerox were real SOBs and refused to share technical info with their customers, who were paying $12K/mo rent on the huge printers (120 impressions/min., two-sided). I altered random bits in the font files, and displayed the distorted results. My apotheosis was selling new fonts to the local Xerox branch.