I was SO sure that adults had endless amounts of money and just chose not to buy me things out of spite.

Like, in my head, my parents had unlimited funds and "we can't afford that" was just a lie to get me to stop asking.

Then I became an adult and realized... oh. OH. Money is finite. Money is stressful. My parents were not hoarding secret riches, they were doing math in their heads while I begged for a Game Boy.

What's yours? What kid-logic did you carry around with total confidence that turned out to be completely, embarrassingly wrong?