RT @mjg59
Github has a couple of "fun" behaviours:
1) It links the email address in a commit to a github user with that address no matter who committed it
2) If a commit is pushed to a fork, it's visible in every fork (including the original)

Which is how you get
https://github.com/torvalds/linux/tree/8bcab0346d4fcf21b97046eb44db8cf37ddd6da0