Lady Gaga's mother: We thought she had a screw loose

Lady Gaga's mother has told Oprah Winfrey that, when her daughter's on-stage 'Gaga' guise was emerging, her father wondered whether their daughter "had a screw loose".

Speaking in New York City, the pop star also said the interview would be her last "for a very long time".

Courtesy of OWN/Harpo productions.