Mine wasn't until I had a job as an developer, which seems strange. Before that, I was just going ahead with uni, and getting developer work because it was a lucrative field.
One day, I had essentially a day at work when I had nothing to do, so at the start of the day, I decide to automate a part of my job to make it easier, and I must have gotten up from my desk twice in the whole day. Before I knew it, it was time to go home.
At that point I thought, "This is quite fun actually"
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