Just for acknowledgment and from personal experiences would like to hear about:

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What was the 'sudo' command you executed which first scared you then made you smile when realized how stupid a move just been done and what damage it caused?

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I recently had rm -rf /boot which been done by auto-completion while my intense was to remove /bootstrap which had some personal scripts and today almost in the same way I deleted a project on which spend almost 2 months with no backups, etc. Still hate myself :)