For a few days I failed to see that I need to add one string escape instead of re-writing the whole S3 file upload logic to hash file names using md5. :( Context: We were not able to retrieve some files with international letters (like German, Chinese, etc) in their names because of weirdly escaped signed URL to S3.

That moment when you get blamed by product/business for a slow feature...
A feature which the same product person demanded you implement two days before the deadline that the feature was supposed to be released at but you never got told about. You end up doing a miracle and the company avoids a lawsuit but you still get blamed for it being slow. Shouldn't have agreed on the ridiculous deadline and left them suffer from their own bad decisions and communication