The list is in response to the joke among Jews that "All our holidays are the same: They tried to kill us. But we're still alive. Let's eat!" Apparently this is not quite true. I guess that's only Chanukah, Purim, and Pesach (Passover).
This ties into so many things in the Wyman household. We were that sort of gentile that celebrated Passover, and even had our own Haggadahs and afikomen bag.