When I was a wee little wtflet, I read "The Lion, the Witch, and the Wardrobe" a million times, but the whole "HAY GUYZ THIS IS AN ALLEGORY LOLZ" thing totally flew over my head. I didn't figure it out until I did a speech on C.S. Lewis in high school.
I am not, apparently, waaaay smarter than C.S. Lewis. :(