The way I found out is thanks to Google. I regularly search for other websites that link back to my website just to see who is citing me. You can do this easily with the following Google query: http://google.com/search?q=link:williamfrantz.com
Another lesser known feature of Google is finding pages similar to my own. You can do that with this query: http://www.google.com/search?q=related:williamfrantz.com
Oh, my winning entry went like this:
Invent a cheesy line of dialogue that thankfully was dropped from a movie. Name the movie, the scene, and the line.
"Luke, I'm your father and I built C3PO so he's your half-brother." -- Darth Vader to Luke Skywalker in Empire Strikes Back