I started by listening to some talks about changing matchframes after a replay had already been started on #ormo, and then realized that you could edit stuff with notepad.
Also Tamer0 used to troubleshoot my replays when they spontaneously glitched, fixing them without me having to remake anything, and I wanted to be able to do that myself.

Then it was most likely NutHug/Tamer0 telling me to read this http://forum.toribash.com/showthread.php?t=19742 to get a bit more knowledge on it.

Learning how the basics functioned I realized that I could recreate tons of superpowers on Toribash and that's what fired me up on hacking.