I was almost 2 days in a task to find the reason of a bug in a client's process, then I found something really weird, that made all the team go to my desk to see wtf was happening, then a guy says, "wait, this was not supposed to be in there, I was editing this process in other environment (he knew it because of the number)" , what did we discover? Someone (they haven't told me who), was supposed to put a file in a folder, just it, but the motherfucker did put the file in the wrong environment folder. I lost 2 days chasing a bug that never existed '-'.