From another comment below, it's just a nice short title to convey that we're going back in time and not one to set your watch by.

    We first submitted the article to the CACM a while ago.
    The review process takes some time and "Twelve years of
    Docker containers" didn't have quite the same vibe.

(The CACM reviewers helped improve our article quite a bit. The time spent there was worth it!)