We've been eating a lot of blueberries this summer and Luke likes to sort through the carton and pick out the ones he wants. He kept telling me he wanted a "drinking blueberry" and I had no idea what he meant, but I would pull out various specimens and offer them to him, to no avail. Yesterday, he came over to me and said, "Look, Mommy! A drinking blueberry!"
He was holding a blueberry -- with a tiny little curved blueberry stem still attached -- up to his mouth and pretending to drink through the stem like a straw.
Another mystery solved!