As a newbie I was given some JCL to test a program change and specifically assured that it only read a more-than-usually important database, used in thousands (literally, it was a large company) of jobs. After 2 or 3 runs I noticed that the output showed a run number that increased by 1 each time and reported it, only to be told that was impossible as my Dev sign-on didn't have update authority. Oh dearie me. Turned out there'd been a special dispensation for another project to update using Dev sign-ons, and the authorisation hadn't been cancelled.
My supervisor was visibly worrying about whether he'd keep his job! Luckily what I was running didn't update client data, only the run number for audit.
Biting the hand that feeds IT
