There aren't any swallows, but I think you can hear a...
5 seconds sound clip from the Monty Python and the Holy Grail movie soundboard.
You can hear this line at 00:43:36 in the Blu-ray version of the movie.
Quote context
[...]
- I mean, they were more than two laden swallows flights away.
- Four, with a coconut on a line between them.
- I mean, if the birds were...
- There aren't any swallows, but I think you can hear a...
- And this enchanter of whom you speak, he has seen the Grail?
- Old man, where does he live?
- He knows of a cave. A cave which no man has entered.
[...]