For 13 to be unlucky would require there to be some kind of cosmic intelligence that counts things that humans count and that also makes certain things happen on certain dates or in certain places according to whether the number 13 'is involved' or not (whatever 'is involved' might mean).
Douglas HofstadterThis idea that there is generality in the specific is of far-reaching importance.
Douglas HofstadterThe paraphrase of Gรถdel's Theorem says that for any record player, there are records which it cannot play because they will cause its indirect self-destruction.
Douglas HofstadterWhat is an "I", and why are such things found (at least so far) only in association with, as poet Russell Edson once wonderfully phrased it, "teetering bulbs of dread and dream" - that is, only in association with certain kinds of gooey lumps encased in hard protective shells mounted atop mobile pedestals that roam the world on pairs of slightly fuzzy, jointed stilts?
Douglas Hofstadter