Blue Christmas.
A greater expression for regret has never been coined.
And yet, without fail, a team of tirelessly drinking young(ish) men and women gather each year and find themselves indulging in heroic quantities of booze, expressing themselves on microphones for hours on end without any rules or inhibitions, and possessing afterwards memories only of a stunning headache and the faint feeling that they’ve probably said a few things they never would have otherwise.