No, there's no telling what the old devil might do.
3 seconds sound clip from the The Sword in the Stone (1963) movie soundboard.
You can hear this line at 00:51:56.680 in the Blu-ray version of the movie.
Quote context
[...]
- If I ever catch you in my kitchen again, I'll...
- We ought to run the old geezer right out of the castle.
- Oh, no. No, no, Kay, no. He might cast an evil spell on the lot of us. Turn us all into stone. Shh.
- No, there's no telling what the old devil might do.
- Now, look here, Wart. That's three more demerits.
- Just because you can't understand something, it doesn't mean it's wrong.
[...]