Too Clever For My Own Good
(2018 sometime)
15 years ago, I accidentally ran a complicated shell command that muffed a couple variables and ended up trying to do a rm-f /.
Through ssh.
Via cron.
On the NIS master system.
Which was in New Jersey.
From Ottawa.
As a contractor.
Fortunately, the OS suicided before it could get to the source code repositories on the same system, so one Jumpstart later (it was a Solaris system) and some judicious restores, they were back in business.
Both my boss and the customer looked at what I had done, understood the intent, and told me to be more careful in the future. I still work for that boss.