Many sites/services seem to make use of a security question as a way of accessing an account if you lose your password or email access.
As an example, Facebook uses this form:
There isn't a question on that list that my closest friends don't know, and most of the answers can easily be found or are a matter of public record in many countries.
What value is there in providing fixed security questions?
Edit: The emphasis here is on having fixed questions rather than on a field where I can type in my own question which I'm sure nobody but me knows the answer to.