Throughout the 17th and 18th centuries, there were many stories of people vomiting amphibians, and most German pathological museums contained vomited amphibians that allegedly lived for years in a person's digestive tract. For example, in 1694, Theodorus Döderlein of southern Germany vomited 21 newts and 4 frogs (see Figure). In 1834, Mrs. Henriette Pfenning vomited frogs in front of applauding crowds of spectators. (She later admitted her hoax -- she stashed the frogs inside her skirt pockets and pretended to vomit the frogs.)
Theodorus Döderlein vomits frogs and newts.
(From Georg Abraham Mercklin's De Incantamentis, 1715.)
Why did these individuals swallow creatures only to vomit (or pretend to vomit) them in front of crowds? (reference 2) No doubt much of it was for attention, although it is possible that obsessive compulsive disorder played a role in some cases. People afflicted with obsessive-compulsive disorder perform endless odd rituals that dominate their daily lives. For example, trichotillomaniacs continuously pull out their hair. Other people with obsessive-compulsive disorder continually wash their hands, check if a door is locked, perform rituals while going through doorways, etc. Almost all people afflicted with obsessive-compulsive disorder recognize their problems and therefore often keep their embarrassing diseases hidden.
The most extreme case of compulsive swallowing is that of a 42-year-old woman who, in 1927, complained of a "slight abdominal pain." Physicians removed 2,533 objects from her stomach including 947 bent pins. In 1985, physicians removed 212 objects from a man whose stomach contents included: 53 toothbrushes, 2 razors, 2 telescopic aerials, and 150 handles of disposable razors.