Ha! As soon as I saw the thread title I knew what you going to say.
It's more common than you think. Astronomy Picture of the Day (a website of NASA) shows things like this all the time. Here is one of the more spectacular ones:
http://antwrp.gsfc.nasa.gov/apod/ap061030.html
One from March:
http://antwrp.gsfc.nasa.gov/apod/ap070324.html and December 2005:
http://antwrp.gsfc.nasa.gov/apod/ap051209.html. Both not as close but still surprises some people.
Here's one from Earth Science Picture of the Day, which mentions that the two has a conjunction (meets) on the 20th. Perhaps that's what
Gabe's dad means by every ten years:
http://epod.usra.edu/archive/epodviewer.php3?oid=362976
Naturally, I missed it as it was raining. I can almost predict the weather by when things like this happen in the sky.
Both are pretty cool websites.