Mine was while I was playing World of Warcraft at around age 26. I got into creating macros and editing the lua code for the addons I was using. Then one day I decided I wanted to make an AutoHotKey script that would run keystrokes over multiple windows and I was hooked. Spent the better part of a full weekend working on a "five-boxing" script and realized I need to be doing it for a living. Was enrolled in school that fall!
Good ol' WoW macros. A lot of people probably don't even realise they're making basic if/else statements when making macros.
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