In 2009, Scott McGready stumbled on a massive phishing scam targeting his company's email server.
Thousands of emails bombarded the company in a short period of time. They all came from the same source, pretending to be someone or something they weren't in order to lure people into clicking on shady links and giving up their personal data.
"While investigating it, I stumbled upon the phisher's database which had [the] personal data of thousands of people," McGready says. "I was surprised how little effort was required on the fraudster's part to acquire such a trove of information."