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Shridhar Chillal (born 1938) holds the world record for the longest fingernails ever reached on a single hand, measuring 6.15 meters (20 feet 2.25 inches).
Chillal’s longest nail is 1.30 meters (4.25 feet).
Although Chillal is proud of his record breaking nails, he had increasing difficulties with their weight, which already caused his left fingers to become disfigured (and more or less useless). Due to nerve damage caused from the nails’ immense weight, Chillal is permanently deaf in the left ear (for he grew his fingernails on his left hand).

Source: http://en.wikipedia.org/wiki/Shridhar_Chillal