Macromedia Flash
It was December 2004, I was sat in front of the computer amazed by a spinning thing. It was blue and mesmerizing. I downloaded an animation made in Macromedia Flash and I was trying to understand how that was created.
I didn't have much coding or artistic skills at that time so I was kind of "brute forcing" into the program.
I overnighted into that giving my best to comprehend all the intricacies of the code.
Late at night I finally got the main concept. I was so excited and curious about the endless possibilities. Perhaps that dawn I went to sleep as a different person than I had woken up.