I need more info. Are you an adult? Who else lives with you? Is someone trying to get your attention? Do you like blueberries? How do you think it got there? Fascinatingly weird...

Are you sure no one's bought blueberries? Because it seems like there some in the house

Put a little juice in the sink, maybe some bits of apple and melon. Pretty soon you'll have a fruit-salad.

I have a feeling you're being trolled.

That's really funny. It's been happening to me recently to I've been finding them in my jeep. No one in my family eats blueberries

Hey guys.. Just here to clear a few things up. I'm not an adult. I'm 13 and live with a family of four. I know nobody has bought blueberries in my immediate family, as my bother has gastrointestinal allergic reactions when exposed. However, my mom's friend, about a month ago, brought a fruit salad to a party. I believe it had some blueberries in it, but cannot understand how they are ending up sitting in the sink. If this happens again I will alert my parents. Don't know how it happens and the sink doesn't have a drain that blueberries will fit through. Starting to creep me out a bit.

lol horror movie alert. Attack of the blueberry spectre

Hopefully someone's just trolling you, OP. Otherwise, yes, alert your parents. Maybe check with extended family. Consider setting up a camera, as well. It could (possibly, weirder things have happened) be an animal of some sort - a raccoon or squirrel. Whether animal or human, though, the camera will catch it.