Chestnut oaks have very large acorns and they grow pretty tall.
The very last time we went tent camping (25 years ago) we made camp under one of these trees, thinking the shade would be nice. Big mistake
For the entire weekend, we were bombarded by acorns about 3/4 inch in diameter and up to an inch and a half long. Dented the roof of our minivan in several places.
Eating outdoors was an adventure. You'd hear an acorn start crashing down from about 80 feet above ground, and wonder where/what/who it was going to hit. We both got a few bruises from "incoming" nuts.