January 3: Memento Mori Day

Memento mori is a Latin phrase translated as "Remember your mortality", "Remember you must die" or "Remember you will die". It names a genre of artistic work which varies widely, but which all share the same purpose: to remind people of their own mortality. The phrase has a tradition in art that dates back to antiquity.
http://www.absoluteastronomy.com/topics/Memento_mori