Hi Jenafur!
Yes, we seem to have "jaw-dropping" moments on a regular basis.
My husband and I are on opposite work shifts-which is good for now since we are in this battle and our son isn't in school yet.
But because of this, we are always hesitant in our excitement until we have checked with each other to see if one of us has taught, explained, experienced, etc. More times than not, the answer is. "no, I don't know where he got that or how he knows it.".
The most recent jawdroppers are: (while handing me a spiderman doll!) " Mommy, here's your Nobel Peace Prize."

" Mommy, today is Yom Kippur. That's a holiday!" ( We aren't Jewish, and have not discussed any religious holidays w/him.) We were just amazed that he was able to read the words and pronounce them correctly.

Then last night, he just rattled off "vitural Insanity".

When we ask him how he knows about these things, he says "they are just in his brain".

Wish I could get a peak inside that brain of his! :-)