Really??

Now I've seen it all.  I have lived in my present house for 33 years. It's located on a fairly busy street and for some reason people driving by seem to think it's ok to throw stuff in my yard. Over the years I've picked up sandwich wrappers, soda cups and straws, beer cans, pop cans, cigarette packs, pieces of wood and plastic and more, much more.  Happily, only about one bit a week but after 33 years it adds up. But today, for the first time ever someone threw a pillow in my yard.  A pillow?? Appeared to be a standard size bed pillow with a blue pillow case. Happily tonight is the night to put out the garbage so, after pushing the cart out to the curb, I gingerly picked up the pillow by one corner and dropped it in the bin  Now the pillow is gone but I'm still left with the burning question - why would anyone toss a pillow in my yard? Any ideas?