- Messed up the Software Engineering dept. Jira when I tried to customize my dept. Jira too much. Took hours to fix, during which time Software Engineering dept. couldn't do any ticketing actions.
- `sudo shutdown -h now` on a remote battery control PC because my terminal was still logged into it via SSH from 5 hours previous. I was trying to shutdown my laptop at the end of the day, and don't like the buttons when I have Tilda hotkeyed to 'F1'. Had to send a technician to the site 2 days later at a cost of several hundred bucks, plus the battery was not operational for 2 days during the most operational time we had in recent months, so we lost money there. I've done several more of this sort of thing that has required a tech, too.
- Forecast that a certain day would be the best day to do a specific operational test, but then fucked up inputting the ISO-format date/time string so it started at 7PM on a Saturday rather than 7AM (I know the format pretty well now: `2018-08-24T23:15:00-07:00`).
- Forecast that a certain day would be the best day to do a specific operational test, but fucked up the script, so it mis-calculated everything and the forecast turned out to be worse than useless (lost the company $30k over 4 hours).
Luckily, my company was fine with all this and we learned a ton from it (other people made similar mistakes, too), so it was useful in some way. I am also way more careful and deliberate about anything now, no more "iterative-keyboard-banging" (my original programming style) in Python while connecting directly to the production database!