4. Blood Everywhere
A patient came in one day with a dire sore throat. Midway through the examination the patient started violently gagging, opened his mouth, and vomited what seemed like every single pint of blood out of his body.
It turns out that the patient had a condition in which the esophagus rubs against the nearby artery, and, if left unchecked, the membrane will fuse together opening a direct link between mouth and heart.