Sarita Bista, has been generating glass from her forehead for last eight months, since January 2006. She sat in meditation for months without any food and drink till she fainted. The next day she began to bleed in the forehead and next day sliver of glass came out of her forehead. Since then she has been producing glass strands of 1.5 inches long and 0.5 inches wide. Around 100 glass slivers have been produced by her till date.
This incident has not been explored by the scientists or rationalists and its veracity is not proven.
Can a human stay for months without food and drink? I cannot really comment about the authenticity of this incident.
More can be found upon searching in google.