They're not the only ones!

In an interview with Oprah Winfrey for an upcoming TV special, Cynthia Germanotta, mother of pop superstar Lady Gaga, admitted to being taken by surprise when she saw her first Gaga performance at Joe's Pub.

Mama Gaga revealed, "She was in her bikini, performing with Lady Starlight, and decided that night ... to actually light hairspray on fire. Her father and I were like ... he said, 'I think she has a screw loose.'"

The interview will be seen this Sunday on "Oprah's Next Chapter" on the OWN Network.