Have you ever come across someone with Munchausen syndrome?

Munchausen is a mental illness where a person fakes being sick (often terminally ill) for the attention they receive from doctors and others. They may even deliberately poison themselves to make it appear more real. Munchausen-by-proxy is an especially disturbing version of the illness where a person makes someone else (often a child) sick for the attention.

A couple years ago I was on another site and interacted with this man who was apparently dying of cancer; he chronicled all his surgeries and his story was very detailed, emotional, and moving, and a lot of people were deeply into it. In the end it turned out he had faked the entire thing.