Elfing is a first-year and sophomore based tradition, which is a favorite among the students.
When the Class of 1966 were first-years, they were, most unfortunately, very obnoxiously hazed during Hazing Day. Concerned by this, the class of 1966, now sophomores, tried to counter future harmful effects caused by Hazing Day by deciding to "care" for the first-years, but in secret. Each sophomore was paired with a first-year. The sophomore left little presents outside the first-year's doors for about a week. These gift-leaving sophomores were called elves.
This went over so well that, while in 1965 the first-year guide listed the sophomore class as "sophomore sisters," by 1966 they were listed as Elves. Under the legitimate wing of the school, Elfing became a delightful tradition.
Today, elfing occurs early to midway through fall semester. One date is set across campus for the start. Typically, the first part of Elfing is covering the first-year's door with newspaper or something fun, so that when the first-year innocently awakes, she'll open the door to startlement. She'll usually find the first of her little elfing gifts as well. The first-year, or, in Elfing, the Elfee (as in the one being Elfed), receives these presents over the course of the week from her Elf who, of course, goes by a false name. After Elfing, the sophomore reveals her still-secret identity.