Hickory nuts. The sqwerls love them. They are good to eat most of the time, but are as much trouble to pick out of the shells are black walnuts.
They also will scare the poopie outta you at 2am, when they start falling on the metal roof above your bedroom from the 60ft tall tree right outside of your house
You can use them to smoke BBQ with. just use a few because they are full of oil and other compounds and will produce a bitter taste if you use too many.
The traditional "courting cake" here in the mountains used to be a hickory nut cake. They are delicious, and a feller knew that if a girl was willing to put the work into cracking and digging out a bunch of hickory nuts to make a cake for him, that she was pretty seriously interested in him.