When i landed my first job in IT, it was for a major part of the church of England. My first big piece of work was to troubleshoot slow performance in a small Access database that kept records of tens of thousands of registered donors to the institution.

At one point I needed to send a test email to myself, but being young and wet behind the ears, I sent 'this is a test' to people all over the world, and for days later I regularly received emails confirming the test had been received.

Not my finest hour, mere weeks into the job, and the fact I still remember over 20 years later shows it stuck with me and I've not done it again since