This isn't just the least-fun thought experiment, it's a medical malady common enough to have its own name. Learn how internal hirudiniasis works (and why you don't need to panic if if happens to you) in this episode of BrainStuff, based on this article: https://animals.howstuffworks.com/marine-life/swallow-leech.htm

How Do We Get Iron and Steel Out of Stone?
11:41

Did a Journalist's Probe into JFK's Assassination Lead to Her Death?
13:33

BrainStuff Classics: Could the Great Depression Happen Again?
09:25