I love Ron's quotes!
"Wild! I can make that old bloke down there pick his nose again...and again...and again..." -Ron
"Lockhart'll sign anything if it stands still long enough." -Ron
"HAVE YOU GONE MAD!" Ron bellowed, "ARE YOU A WITCH OR NOT!"
"That'll change the world, that report will. Front page of the Daily Prophet, I expect, cauldron leaks." -Ron
"A study of Hogwarts prefects and their later careers," Ron read aloud off the back cover. "That sounds fascinating."
"Aaaah," said Ron, imitating Professor Trelawney's mystical whisper, "when two Neptunes appear in the sky, it is a sure sign that a midget in glasses is being born."
...and my favorite one of all:
"Percy wouldn't recognize a joke if it danced naked in front of him wearing Dobby's tea cozy." -Ron