My parents have three (living) chestnuts on their property (I guess the blight missed them because the trees have been there for a very long time). Those chestnut burs are a real headache. If you ever make the mistake of stepping on one, you'll be pulling needles out of your foot for a while (imagine stepping on a sea urchin). Cleaning them up is also a pain (make a mistake and they'll go straight through leather gloves). I can't imagine if 4 out of 5 trees I saw dropped those things.