Sketchpad: The first object-oriented software system (1963)

I'd believe it. I remember when I was just learning to program, I used to do crazy hacks to do stuff I had absolutely no idea how to do because I didn't know it was hard. That is, I tried anyway and tried weird ways I mightn't even think of now, simply because I didn't know any better. The code was terrible, but I got results.

Nothing near as hardcore as the first interactive graphics program, the first non-procedural programming language, and the first object-oriented software system in one year, sadly ;-)