Shrek The Third Easter Egg - A Few of My Favourite Things

At the part where the princesses are escaping the prison cell, Fiona's mother knocks down the cell wall with her head. When she does this a second time, she becomes dazed and starts singing the song "My Favorite Things," which was a song sung by Julie Andrews in the film "The Sound of Music." Julie Andrews also does the voice of Fiona's mother in Shrek the Third.