We always knew our favorite nanny had it in her.
Watch Julie Andrews' Mary Poppins belt out a death metal version of the Disney favorite "Supercalifragilisticexpialidocious" -- with a little help. Youtuber Andy Rehfeldt's hilarious clip syncs in vocals by Sera Hatchett and Thomas Hinds, with Rehfeldt playing the instruments.
Oh, Mary, you old headbanger you.
H/T Laughing Squid