UPDATE: She's not a random grandma anymore! In fact, she's not a grandma at all. Mary Hvizda never had any kids. She's 63-years-old, and she's been playing the drums since she was 15. She's played in over a dozen bands through the years. Her last band broke up in 1990, though. She said, "It makes me proud to think that people still think I'm somewhat good and still think I'm still something they're interested in watching." Hells yes, lady. You are still VERY GOOD.
This woman just showed up randomly to a music store in Wisconsin and showed everyone up. She even gets all fancy, twirling the drumsticks. What a show off. :P (Gawker)