https://en.wikipedia.org/wiki/Order_of_the_Arrow
"Candidates subsequently participate in an Ordeal, intended to emphasize service and selflessness. During the induction, "candidates under go a 24 hour vow of silence, receive small amounts of food, work on camp improvement projects, and are required to sleep alone, apart from other campers, which teaches significant values." If they succeed in their ordeal the candidates are then welcomed as Ordeal members in a formal Ordeal Ceremony."