I participated in an interview today. One of the questions I usually ask is "Do you have Oracle installed at home?"
It's more a question to gauge their nerdiness than anything, see if they're obsessed like me. Does it always mean that they aren't smart or capable? No, not really. That will come out through the other technical questions. For me at least, it does indicate a curiousity about how the software works.
So, do you have Oracle installed at home?