A month ago I purchased a cart of organic blueberries. Two seeds were left in the bowl when I had finished eating them. They were not intentionally dug out from the berries, they just ended up that way. Yesterday I noticed they had germinated, as I stuck them in a plastic bag with a moist napkin in it, and was keeping them near a window with sunlight.
I moved them in a planter outside. Hopefully early spring isn't too hard on them.