My fantasy novel got hijacked by a vending machine character
I was stuck at chapter 17 with my hero about to face the dragon lord, but I couldn't decide if he should sneak in through the sewer grate or bluff his way past the guards. So I flipped a coin, went with the sewer, and somehow ended up writing a 3 page scene where a wisecracking soda machine in the tunnel gives him quest advice. Now I'm 40,000 words deep and the machine, named Clank, has more dialogue than my actual protagonist. Has anyone else had a random side character just take over their whole outline?