Droobles Gum mystery solved!

[quigonginger]

No: HPFGUIDX 131727

You heard it here first folks.

Alice *is* sending a message to Neville with the gum wrappers.  It's 
CHEW CHEW CHEW CHEW.

Or CHOO CHOO CHOO CHOO.

Yes, the answer to the mystery lies with the trolley lady on the 
Hogwarts Express.

Neville only needs to ask her for Droobles, and she will reveal all.

I'm sure this is news to all of you.  It would be news to JKR too.

Ginger, needing a moment of silliness in her life.