It's my curse of choice, from Dido's dying speech about Aeneas: "May he fall before his time and lie unburied in the middle of the sand!" Or the arena (so known because it was covered in sand to soak up the blood), or the tracking gallery, or wherever.

The story is that Charles I got this line when he attempted to use the Sortes Vergilianae, picking a line of Vergil at random to predict the future.