Some of these cases are more bizarre than others. People can fake illness, and can be pretty good at fooling family, friends, and medical practitioners. But the story of Mary Toft was totally over the edge.
Toft captured the imagination of England when she "gave birth" to several rabbits and parts of other animals in the presence of numerous physicians and skeptics. The charade went on for months, perpetuated by daily newspapers, which were still a novelty. And back then, every newspaper resembled the Weekly World News, in which Bigfoot attacks are every bit as newsworthy as local politics.
It's true that physicians confirmed the story, although they were under political pressure to do so. Read this story and more at Cracked. Link