[Crazihors]

I think one of my favourite lines is in OotP when Ron says 'One person can't feel all that', and Hermione replies 'not all of us have the emotional range of a teaspoon, Ron' and I was so happy when they put it in the movie!
also in OotP when they go to see Grawp, and Harry and Hermione are telling Ron about it 'and he knows me', Hermione sniffed, 'as Hermy'

there are others, but I'll have to reread...most of DH was very funny