@futurebird my favourite one is when I was little I'd do some scripting for a game (well, the multiplayer mod, SA-MP) and then one day I came across the source code of the mod itself and realized that it's using the same printf() to write things to the screen. It blew my mind that it's so simple (the rest wasn't but y'know). I thought regular programs were these impossibly hard to make things.
I've been working as a programmer for a few years now after all the hobby projects heh.