My aunt said over Christmas that she would send Eli a copy of “Chicka Chicka Boom Boom” in the mail since she has multiple copies and Eli, for whatever reason, has managed to not collect that book. This afternoon a large envelope came for Eli in the mail. I told him he’d received a package. He looked up at me and said, “Oh, it’s my “Chicka Chicka Boom Boom” book. Of course, he was right.