This "concerned citizen" took it upon herself to steal a kid's bike and teach them a lesson. That lesson? Something along the lines of "don't be a kid who rides your bike when I can faintly hear you riding your bike. And don't leave that bike somewhere where I can take it and hold it hostage." It's a mystery as to why a person like this would live alone. She went so far as to demand a written apology in exchange for the bike.
Most kids would probably just cave to the demands of a grown-up, irrational as they may be, but OP had a taste for justice. Or at least petty revenge. They weren't gonna put up with this without a fight, and decided the natural course of action should be to leave some surprises for this lady to not find for a long time. Karma is real, and it stinks.
It's weird when adults feel like they're justified in stealing from or victimizing kids for doing nothing other than being kids. For example, here's this entitled parent who kicked kids off a playground and wondered if they were in the wrong.
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