A deadhead is a tree that's floating just beneath the surface of the water, waiting for you to hit it and sink your boat. A kettlebottom is a tree that got fossilized in a peat bog and became a coal seam, waiting to fall out of the mine roof and squish an unsuspecting coal miner. A widowmaker is a loose tree branch that is likely to fall off and crush someone's husband. The trees have always been against us.