You don't want to go making friends with the wrong sort.
5 seconds sound clip from the Harry Potter and the Sorcerer's Stone movie soundboard.
You can hear this line at 00:43:06 in the Blu-ray version of the movie.
Quote context
[...]
- It's true then, what they're saying on the train. Harry Potter has come to Hogwarts.
- This is Crabbe, and Goyle. And I'm Malfoy. Draco Malfoy.
- Think my name's funny, do you? I've no need to ask yours.
- Red hair and a hand-me-down robe? You must be a Weasley.
- We'll soon find out that some wizarding families are better than others, Potter.
- You don't want to go making friends with the wrong sort.
- I think I can tell the wrong sort for myself, thanks.
- We're ready for you now. Follow me.
- It's not real, the ceiling. It's just bewitched to look like the night sky.
- I read about it in Hogwarts: A History.
[...]