Here are some examples. I used the computer so much as a kid that my parents used to try to stop me. First they put a password on the boot-up. I read everything I could until I learned to flash the BIOS. Next they installed this enuff computer time restricting system, which I spent a ton of time breaking. Over a period of two or so years, my actions provided the first line of bug testing for the Enuff programmers. Boy were they furious. Eventually I built a keystroke recorder, and that stopped that for a while. They couldn't keep me out.
Other hackerly things I liked to do included turning the scripting languages in games into other games. I wrote a really cool RPG in Starcraft, for example. I also learned how to automate tasks in 3DSMax, which was really fun.
At some point I hacked college entry, and I was in there way earlier than authorities thought that I should have been. By this point a 'hacker' identity was already written for me, but most of the interests started way, way earlier.