They're at it again, step in time.
6 seconds sound clip from the Mary Poppins movie soundboard.
You can hear this line at 01:54:18 in the Blu-ray version of the movie.
Quote context
[...]
- Fire!
- Well hit, sir! Very well hit!
- They're at it again, step in time.
- Never need a reason, never need a rhyme. Whoa!
- Oh, Ellen, when you have a second...
- Votes for women, step in time.
[...]