There's not supposed to be any monkey business.
5 seconds sound clip from the The Breakfast Club movie soundboard.
You can hear this line at 00:15:42 in the Blu-ray version of the movie.
Quote context
[...]
- I have such a deep admiration for guys who roll around on the floor with other guys.
- You'd never miss it. You don't have any goals.
- Oh, but I do. I want to be just like you.
- I figure all I need's a lobotomy and some tights.
- No, I don't wear tights. I wear the required uniform.
- Tights.
- Shut up.
- There's not supposed to be any monkey business.
- Young man, have you finished your paper?
- Come on, Bender. Don't screw around.
- That's very funny. Come on. Fix it. You should really fix that.
[...]