A while ago a small company I was working for was acquired by a huge national company. Through "synergy" I ended up in working in BI doing ETL from the systems

A while ago a small company I was working for was acquired by a huge national company. Through "synergy" I ended up in working in BI doing ETL from the systems we used into their DB2 warehouses. When there were errors, we'd manually go through the error log and manually insert the erroneous rows. During this transition I was given a set of credentials that, apparently were used in the actual, daily production job, without me being aware. Well, I managed to lock that account out with 3 bad password attempts. It was a huge ordeal; everyone of my director and VP were reprimanded. Noone publicly blamed me because it was, obviously, stupid to run production jobs with credentials you give to some guy watching ETL that day, but I was still quite embarrassed.