We stayed at a campground in a forest on the western side of the Sierra Mountains in California. There were a mixture of trees including some tall Sequoia trees. These have pine cones which when green are very solid and heavy. They can be up to a foot long and have a sharp pointy end.
The whole time we were there these kept falling. Squirrels would chew on the stem and drop them to the ground so they could chew into them to get the seeds.
They never hit our RV but a nearby TT had the roof punctured by one of these pine cones. It went through the roof and ended up on the floor.