It is a sacred tradition at UCJAS that every winter, we take advantage of Suicide Prevention Day (aka Undergraduate Break Day) to show an anime that is so colossally depressing that when it's over your homework will look positively therapeutic.
Depressing Anime of Years Past include:
2004 Neon Genesis Evangelion
2005 Serial Experiments Lain
2006 Revolutionary Girl Utena, season 3
2007
2008
2009
2010 Ayakashi: Classical Japanese Horror - Bake Neko arc and Mononoke
2011 Black Rock Shooter and Batman Gotham Knight