I wanted to update this old thread with another one from dd tonight while brushing teeth. Just when I think this dates thing is gone...

dd (just turned 6): I always do a good job brushing my teeth because I don't want to get any more cavities. Remember when I had to get that one filling? On September 9, 2008. (pause) Or maybe September 19th. I just remember there was a 9 in the ones column.

So, of course, I drag out the old calendars. September 9, 2008. dd Dentist appointment - cavity filled - 12pm.

I did think the "9 in the ones column" statement was interesting. This whole thing must have to do with numbers for her...