Patio Furniture

I currently have some interesting items on my patio/balcony that do not belong to me - a pine cone, a "white pebble eraser" and a lipstick-shaped foam thing.  I have no idea how any of these got here - maybe a bird dropped them there, maybe a disgruntled neighbor (perhaps annoyed by the sound of my wind chimes) threw them up there, maybe kids had something to do with it (I'm wondering whether the foam thing might be a projectile from one of their toy guns).  But none of them are small enough to be an accident.  And all of them are big enough to crack a window.  Weird.