Reasons the Weasley twins are my favorite characters:

• George (to Harry about his Christmas sweater): "You haven't got a letter on yours",
• Fred: "I suppose she [Mrs.Weasley] thinks you don't forget your name. But we're not stupid - we know we're called Gred and Forge."
• ~~~
• Fred: "Don't, Ginny, we'll send you loads of owls.'
• George: 'We'll send you a Hogwarts toilet seat.'
• Mrs. Weasley: 'George!'
• ~~~
• Fred (after Harry gets done with a huge rant): "You don't want to bottle your anger up like that, Harry, let it aaaall out. There might be a couple people fifty miles away who didn't hear you."
• ~~~
• Mrs. Weasley: "Oh, Ron a prefect?! That's everyone in the family!"
• George: "What are Fred and I, next door neighbors?"
• ~~~
• George: "--but you get these massive pus-filled boils too, and we haven't worked out how to get rid of them yet."
• Ron: "I can't see any boils,"
• Fred: "No, well, you wouldn't. They're not in a place we generally display to the public --"
• George: "-- but they make sitting on a broom a right pain in the --"
• ~~~
• Fred: "Percy wouldn't know a joke if it danced in front of him naked wearing Dobby's tea cozy."