The saddest moment in a person's life comes only once.

Related:

• An egg has the shortest sex-life of all: if gets laid once;
  it gets eaten once. It also has to come in a box...
• A moment is a lifetime....
  but only for a moment...
• Santa only comes once a year,
  too bad for him...
• A man is already halfway in love with any woman who listens to him.
  Brendan...
• What an author likes to write most is his signature on the back of a cheque.
  Brendan...
• The world is a madhouse, so it's only right it's patrolled by armed idiots.
  Brendan...
• The most egotistical person we've ever heard of is
  the one who remarked that he had only been wrong once...
• If of all words of tongue and pen, The saddest are,
  `It might have been,' More sad are these we daily...