We have a large oak tree in our front yard. It provides wonderful shade in the summer that makes a noticeable difference in the temperature inside the house, and I think it looks nice, too.
Autumn brings a challenge. Autumn brings...acorns. Lots of acorns. Lots and LOTS of acorns (it's really quite amazing how many). So many acorns that the yard and driveway under the tree go "crunch" with every step. And if you are standing under the tree?
We have all been clonked by acorns, and my day is punctuated by the "thwack" of acorns hitting the car in the driveway (or the trailer, at the moment). This year has been particularly dangerous, and there are times it almost sounds like rain, there are so many falling (a hard rain, get it?).
It doesn't quite reach the level of aggression of the Whomping Willow from Harry Potter, but it does sometimes feel as though the tree is deliberately pelting us. It's a good thing it doesn't have better aim, but it's best not to linger underneath.
Or wear a helmet.