On Friday morning, the day before Christmas, I decided to roll out a small update that would fix some minor bugs people had reported.
Taking responsibility for the things you launch
Adrian Zumbrunnen

Wow a release the day before Christmas! You couldn’t have possibly thought of a worse day to release an upgrade. In my previous job we aimed for software upgrades mon-wed so we didn’t do it end of the week and particularly banned Friday upgrades because it could mean lost and very stressful weekends. Guess you learned your lesson. It would be nice to hear your thoughts on how you will test and release patches safer in future.