There be a trick to it, of course.
3 seconds sound clip from the The Last Unicorn movie soundboard.
You can hear this line at 01:03:51.361 in the Blu-ray version of the movie.
Quote context
[...]
- Well, then, she must do what she came to do. She must take the king's way down to the Red Bull.
- Is there a way? Tell me the way. Tell me where we must go!
- Avast! Hark ye closely, mum.
- When the wine drinks itself, when the skull speaks, when the clock strikes the right time.
- Only then will you find the tunnel that leads to the Red Bull's lair, har har.
- There be a trick to it, of course.
- Why won't you help me? Why must you always speak in riddles?
[...]