They're off! It's Mary Poppins leadin' by two lengths. Jane is second by a length. Michael third...
8 seconds sound clip from the Mary Poppins movie soundboard.
You can hear this line at 00:52:20 in the Blu-ray version of the movie.
Quote context
[...]
- Very nice. Very nice, indeed... if you don't wanna go nowhere.
- Who says we're not going anywhere?
- They're off! It's Mary Poppins leadin' by two lengths. Jane is second by a length. Michael third...
- Do you hear that, mate? Do you wanna put up with that?
- Come on, my lad. Is that the best you can do?
[...]