So I had just read MINISTRY FOR THE FUTURE, and I started thinking about what the world would look like if we'd avoided environmental collapse (fingers crossed), so that became the place my protagonist lives when she's abducted, and then I just started riffing, and 10,000 words/five weeks later, I ended up creating an allegory for how fucked up high school is, a critique on policing and mental health, and a scathing rebuke of STAR WARS.
No big.