Don't mess with the bull, young man, you'll get the horns.
5 seconds sound clip from the The Breakfast Club movie soundboard.
You can hear this line at 00:07:51 in the Blu-ray version of the movie.
Quote context
[...]
- My office is right across that hall. Any monkey business is ill-advised.
- Yeah. I got a question. Does Barry Manilow know that you raid his wardrobe?
- I'll give you the answer to that question next Saturday.
- Don't mess with the bull, young man, you'll get the horns.
- That man is a brownie hound.
- You keep eating your hand, you're not going to be hungry for lunch.
- I've seen you before, you know.
- Who I think I am. Who are you? Who are you? I am a walrus.
[...]