I had to read Julius Caesar in 10th grade, and for some reason, that line always stuck with me; Consequently, I notice the coming of March 15 with great interest. I'm not particularly superstitious, but I just like to see if there are any coincidences on days like the Ides of March and Friday the 13th (which, by the by, is coming in April).
Since Shakespeare's play, the Ides of March has become synonymous with a foreboding sense of doom. I haven't experienced it myself, but hey, the day isn't over yet.
So, click on the Wikipedia link and indulge in a bit of interesting trivia.