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 Manatees Work?
09:36

Why Do We Put Diamonds on Engagement Rings?
11:55

How Did the Stonewall Riots Work?
16:58