What Can Go Wrong with AWS Services?

I'm curious about real-world case studies on how AWS services can fail organizations. Is there a collection of examples or experiences detailing what might go wrong when using a specific service? For someone new to a service (or returning after a long time), it's essential to be aware of potential pitfalls and hidden issues. We often think about billing problems, but security gaps and performance drops due to minor oversights can also be significant concerns.