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Me too. I accidentally SSH'd into the wrong data center and ran a for loop restarting every database server once.

Fixed that by putting the DC domain in red on the prompt.

I did once, too. Unfortunately, it was company of 4 people so I was also the dev team. :-) Never did it again though (yet).

Kudos to the dev team for that, I think most people wouldn't own that kind of issue

It was a very well-run engineering department where taking blame was not a career ending decision. I took full blame for the typo (at 3am trying to resolve a customer issue), but the dev team accepted full responsibility for letting it take down the system.

Every mistake was used as a learning opportunity to ensure that the same and similar mistakes can't be repeated.