Late 90's, I'm lead dev for a large site. Company hires a DBA. We partner with a VERY large content provider. I'm awake for 48 hours buttoning things up, last minute stuff. I finally collapse from exhaustion only to be woken up at 7am on - go live day.

Nothing works.

A few moments debugging reveals that all the column names in a key set of our datasets have been renamed. No time to waste, I rename them all back as quickly as possible. We go live, no one is the wiser.

We contact the DBA and explain the folly of his decision.

He then proceeds to rename everything AGAIN on a live system. No we didn't shoot him lengthwise, but we did fire him with some prejudice.