It seems suspect that a question was asked by user 20553 at exactly "asked Dec 12 '08 at 10:38" and answered by same user on exactly the same date and time "answered Dec 12 '08 at 10:38". If you look at the question and answer it doesn't seem the same user wrote them, maybe the web interface is buggy when displaing that question. Can you check it out please. (I'm not sayng the user did something wrong, but for me it seems more like a display bug then a valid user action)
Here is a link to the question. Screen shoot atached.