My house in Seattle had mold behind the bathroom wall once. It looked bad at first, but we dealt with it pretty easily. We just cleaned the area with a bleach mix and let it dry out completely. People often panic over mold, but most types aren't really dangerous. It's usually a sign of moisture you can fix, not a reason to tear down walls. So from my view, it's more about routine maintenance than a scary problem.

Just have fun, not my movie overthinking, lol @wyattc77.