#HugOps to GitHub Engineers! Such things are usually stressful, especially before the weekend. In addition, in some European countries today is a bridge day (day between a holiday and the weekend, many people take off on such a day).
Having done on-call work, the most annoying bugs are the ones that you feel could be automated (especially when the pager goes off when you're asleep). Not to say that I hope these guys get called out, but it's the nature of the job.
That is the work-ethic i would love to see from all manager.
Excellent attitude to life/work.