An example that comes to mind is when I was at university a fellow student built something that was effectively a speed dating type website for students. He pu

An example that comes to mind is when I was at university a fellow student built something that was effectively a speed dating type website for students. He put out the code on the university FTP server so I got a chance to look at it. Plenty of stuff in there that could easily have been exploited, luckily the site didn't really take off and I was able to help him fix the vulnerabilities (at least the ones that I could identify). If someone malicious had got into that , they would have been able to read a whole bunch of information including private messages sent between users, that could have been something that could certainly have had some bad effects on some people's lives.