I should mention that one of the pages I found had the immortal line, "If you suffer from Trichophagia, PLEASE consult a doctor as this can be extremely fatal."
UPDATE: From the Bombay Hospital Journal
In addition to the above-mentioned phytobezoars; this one needs a special mention for its uniqueness. This kind of bezoar is caused by a pill said to be made from the blood of a species of chameleon in combination with certain East Indian drugs. This was used by a certain Brahmin widows of the Western Taluks of Bellary District (Pre-independence Madras Presidency, prior to the formation of Mysore State, which was later named as Karnataka) to cause the slow decline and death of strangers who happened to share their table. There is a superstition among them that this mode of doing away with young and energetic men, mostly executive officials[,] paves the way for their [that of the young men, or the widows'? --me] salvation. Whatever the object might be, the bolus of food in which it is administered forms the Bezoar, with the minute pill as the nucleus, and the food around never gets digested. This is proven by the fa[c]t that even after six months the vomited bezoar, if it fortunately occurs, contains the very food in which it was administered originally. This kind of Bezoar acts in the same manner as all the others and causes symptoms akin to them.