Beware, boy, he is dangerous.
3 seconds sound clip from the The Secret of NIMH (1982) movie soundboard.
You can hear this line at 00:41:55.930 in the Blu-ray version of the movie.
Quote context
[...]
- Now... Oh, yes. Why did you send for me?
- It's Jenner. He's at it again.
- He's before the council now. This time he's attacking Nicodemus openly.
- Nothing will come of it. It'll pass.
- Beware, boy, he is dangerous.
- Jenner could be the undoing of the rats of NIMH.
- I'm sorry to come here at such a bad time. I suppose...
- No, sweet lady, you are welcome here.
- We tend to take ourselves a little too seriously.
[...]