A young woman was worried about her stress-related habit of biting her fingernails down to the quick, so her friend advised her to take up yoga. She did, and soon her finger-nails were growing normally. 

Her friend asked her if yoga had totally cured her nervousness. "No," she replied, "but now I can reach my toe-nails so I bite them instead."

Courtesy: cleanlaffs.com (new window)