Ravenclaw: Slytherin, keep an eye on Gryffindor today. They're going to say something to the wrong person and get themselves punched.
Slytherin: Sure, I'd love to see Gryff get punched.
Ravenclaw: Try again.
Slytherin: *sigh* I will stop Gryff from getting punched.
Ravenclaw: Correct.