Secret societies ====
Yale's secret societies include Skull and Bones, Scroll and Key, Wolf's Head, Book and Snake, Elihu, Berzelius, St. Elmo, Manuscript, Brothers in Unity, Linonia, St. Anthony Hall, Shabtai, Myth and Sword, Daughters of Sovereign Government (DSG), Mace and Chain, ISO, Spade and Grave, and Sage and Chalice, among others. The two oldest existing honor societies are the Aurelian (1910) and the Torch Honor Society (1916).
These are akin to Harvard finals clubs, Princeton eating clubs, and senior societies at University of Pennsylvania.
=== Traditions ===
Yale seniors at graduation smash clay pipes underfoot to symbolize passage from their "bright college years", though in recent history the pipes have been replaced with "bubble pipes". ("Bright College Years", the university's alma mater, was penned in 1881 by Henry Durand, Class of 1881, to the tune of Die Wacht am Rhein.) Yale's student tour guides tell visitors that students consider it good luck to rub the toe of the statue of Theodore …
