Gryffindor:

Hermione: Harry, don't go picking a row with Malfoy, don't forget, he's a prefect now, he could make life difficult for you...

Harry: Wow, I wonder what it'd be like to have a difficult life?

Ravenclaw:

Skeeter: I wonder if you could give me a quick word?

Harry: Yea, you can have a word- goodbye.

Hufflepuff:

Vernon: Listening to the news again?

Harry: Well, it changes every day, you see.

Slytherin:

Harry: Yes.

Snape: Yes, sir.

Harry: There is no need to call me sir, Professor.