Yes, I have heard of this!
Often I have to remind myself of this syndrome when I do encounter people who seem to be feigning illness. The last time I went to hospital I was in the ITC (Intensive Treatment Center) for most of my stay but when I was transferred back to the regular ward, I ended up rooming with a 13 year old girl who claimed she had bulimia, and yet, she always ate ALL of her food during breakfast, lunch and dinner and I haven't ever heard her once try to purge after a meal. I would spend all day, literally, all day in my room reading and she's never once came in to purge.

Then when she was filling out her intake papers, she told me they were "stupid" and "not worth her time". Then when I told her that I have a personality disorder, she was like, "Oh yeah, I better fill out my papers!" As if that was going to give her a diagnosis like me? She really annoyed me.

But yes, I have to keep reminding myself that Munchhausen syndrome is out there.