Julie Andrews and Carol Burnett are longtime friends and during their performance at Carnegie Hall in the early 1960s, they did a parody of the Von Trapp Family Singers. It should be noted this was before Julie starred in The Sound of Music. These ladies are both stellar apart, and together, they are just too funny and so talented!
A funny piece of trivia: at the end when Carol clocks Julie in the stomach, you can see her stop and ask if Julie's okay. Just before the show, Julie found out she was expecting, and they decided not to do the hit, but Carol forgot once she was caught up in the performance!