It's OK, Harry...maybe the worm is symbolic for Ginny?
So I got myself The Tales of Beedle the Bard recently...and killed myself laughing at the Fountain of Fair Fortune.
I mean, seriously...what the SHIT was the worm about. It's the way she wrote it so casually, and how after the face sucking had happened, none of the characters were even a little bit freaked out by it. :'D
If you haven't read it yet, GO GET IT. It's brilliant.