Comment Atari 800XL (Score 2) 623
I got my 1st computer, an Atari 800XL from my grandmother in Germany as a First Communion present. When I got bored of playing Donkey Kong, I took a look at the manual, wrote the first example, and ran it.
I was so amazed, that I started tweaking the numbers in the code and saw which effect they had. That's when I discovered the power XD