Oh, awesome, nobody posted this one yet. It's probably the dirtiest sounding line in the entire series (and I've thus not only shared it with many people, but read it aloud in a smutty voice a couple times):
"Harry pressed his mouth again to the Snitch, kissing it, nearly swallowing it, but the cold metal did not yield..."
My friends and I have agreed that maybe this was actually somethign from erotica Rowling was writing under a pseudonym and she meant the "i" to be an "a."