[HBP]

I remember my favorites quite clearly.

Hermione in PS: I'm going to bed, before either of you come with another clever idea to get us killed or worse expelled.

Dumbledore always said there are things worse than death.......looks like Hermione thinks being expelled is one of them.

In GOB when Mr. Weasley and the boys went to get harry and were stuck inside the fireplace.
Ron: What are we doing here? Has something gone wrong?
Fred: Oh no Ron, this is exactly where we wanted to end up.
George: Yeah, we're having the time of our lives here.

i think this was in POA
Snape: That is the second time you've spoken out of turn Miss granger , are u incapable of restraining yourself or do u take pride in being an insufferable know it all.

I think those were my favorites.