Early in March of 44 BC, Julius Caesar was warned by an augur (named Spurinna) that a great calamity would befall him on the Ides (the fifteenth) of that month.

On that fateful day, Caesar happened to encounter Spurinna on his way to the Senate house. "The Ides of March have come," he said with a smile. "Yes, they have come," Spurinna replied, "but not yet gone."

[Sure enough, Caesar was assassinated later that day by a group of republicans led by Cassius and Brutus. (Shakespeare quotes the line as: "Ay, Caesar; but not gone.")]

[According to Chase's Calendar of Events, March is "Keep Your Shoelaces Tied Month."]