As a society, we celebrate milestones. Birthdays, anniversaries and graduations result in a party with our family and friends, or a nice meal with the persons we love. We give gifts to honour the person who is celebrating this special occasion. Overall it is usually a joyous moment. On the other hand, some milestones don’t feel as joyous. These are moments that, as a society, we prefer to call commemorations rather than celebrations—usually tragic events such as an accident, death or worse.