The Jewish holiday of Hanukkah may not receive quite the same level of attention as Christmas. But as Adam Sandler pointed out in his hit “Hanukkah Song,” the holiday, which starts this year on Wednesday evening,

The holidays are extra special this year. Not only is Dec. 25 Christmas, but it marks the beginning of Hanukkah. This particular alignment of the holidays is rare. In fact, it has only occurred four other times since 1900,

It’s an “oy to the world” moment. It’s a mashup of Christmas and the first night of Hanukkah. It happens about once every 20 years, and this year, it happened. There’s even a nickname for this day “Chrismukkah.