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xkcd #3245: Results Age
(imgs.xkcd.com)
Title text:
Please, we need your help. Our research suggests you're the last living descendant of the person who knew how to format this config file.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3245/
Or when the person with the answer deleted their account and all messages with it, then all of the comments after say “That worked!”