" The trees do not like strangers. They watch you. They are usually content merely to watch you, as long as daylight lasts, and don't do much. Occasionally the most unfriendly ones may drop a branch, or stick a root out, or grasp at you with a long trailer. But at night things can be most alarming, or so i am told. "

― J.R.R. Tolkien , The Fellowship of the Ring (The Lord of the Rings, #1)