Artyom Sidorkin, a 28-year old Russian, went into the hospital complaining of chest pain. After some x-rays, doctors were convinced they'd found a tumor in his lungs. When they went in to remove it, they found a 5 centimeter fir tree. Not a branch. A tree. Not in his stomach. In his lungs. Turns out he'd been coughing up blood because pine needles were stabbing his capillaries.
This is the best part...the doctors believe "that the patient might have inhaled a small bud, which then started to grow inside his body." [source]
What. The. Frak.