Is a true evil tree born or made? The tree in the Freeling's yard is just an ordinary old oak (I think) until the night evil spirits decide to make their appearance. Inhabited by said spirits, it bursts into the house, grabs a young boy, and attempts to eat him. Does it have teeth? What exactly happens when you enter a tree's digestive system? Somehow, it doesn't matter. This thing is seriously creepy, and even though it didn't get much screen time or actually eat anybody, that bulky, dark brown, disturbing mouth is one of those things you can't unsee, no matter how hard you try.
4) Every Christmas Tree On Earth, Treevenge
Hell hath no fury, apparently, like a tree wronged. These poor guys are cruelly wrested from their homes, sold to grinning strangers, tortured, humiliated, even sexually assaulted (which can't even be that pleasurable for anyone involved). It's no wonder that when their retaliation comes, it is insanely brutal, going places even Robert Rodriguez hasn't dared. Be warned, it is nothing less than an all-out bloodbath.
3) Old Man Willow, The Lord of the Rings
2) Rape Tree, Evil Dead
This is another example of a tree made evil by outside forces. Not much to say except that this is still one of the most disturbing and controversial horror scenes ever. Ancient demons inhabit the trees of a forest and use them to assault and torment poor Cheryl before finally possessing her too. If you've seen it, you know it belongs here, and if you haven't, you're probably that much more comfortable in the woods at night than the rest of us.
1) This Fucker