Me: Come on buddy, we gotta go!
Evan: (With open book in hand) Daaaad, I'm looking for something to use as a bookmark.
Me: You used to have a bunch of bookmarks around here, did you lose all of them?
Evan: (With expression as if talking to a dolt) I'm using all of them. (Helloooooo?)
When I was nine, I doubt if I even had any bookmarks, much less knew what their purpose was!