"Dont let the muggles get you down" - Ron Weasley

From the fifth movie "Obviously" by Snape, I quote it all the time. Or Hermione "You, foul loathsome evil little cockroach." From the third book.

"Do not pity the dead, pity the living"

HARREH DIDJA PUTYA NAM INDA GOBLETOFFIYAHHHHHHH

Whatever Sev was swearing at James during that one chapter where James just had to hang Sev in midair

“I wouldn't go out with you if it was a choice between you and the giant squid.” Lily Evans to James Potter.

I ship Jily, but I liked the quote so much I once used it. (I promised myself that I’d go on the date with him anyway if he got the reference. He didn’t.)

Lily was such a wise girl, some thing got wrong with her in her 7th year...

"Happiness can be found in the darkest of times, if only one remembers to turn on the light."-Albus Dumbledore

thats my favorite too!