Spotted at Lobsters is a thread about a stackoverflow question on man; why does running "man -w" report "gimme gimme gimme" when run at 00:30?
This gets this response:
Pretty much the whole story is in the commit. The maintainer of man is a good friend of mine, and one day six years ago I jokingly said to him that if you invoke man after midnight it should print "gimme gimme gimme", because of the Abba song called "Gimme gimme gimme a man after midnight":
Well, he did actually put it in. A few people were amused to discover it, and we mostly forgot about it until today.
The commit in question, and more commentary over at HackerNews.
Anyone know of other good easter eggs that have cropped up unexpectedly and caught users out?
(Score: 4, Informative) by ncc74656 on Thursday November 23 2017, @03:49AM
Only if you're parsing stderr instead of stdout. Here's the relevant set of lines in man.c, which I'll run together since the indentation will be fscked up anyway: if (localnow && localnow->tm_hour == 0 && localnow->tm_min == 30) fprintf (stderr, "gimme gimme gimme\n");