Question #1

[Goddlefrood]

No: HPFGUIDX 183350

> CJ:
> ... Dueling Club, when Harry was unaware that he'd been speaking 
> parseltongue.

> Any theories as to why that would be?

Goddlefrood:

Must be because Harry didn't know at that time that he spoke 
Parseltongue, although one would have thought that hissing 
would sound different from English, eben to Harry at that 
point. Harry must have been so familiar with Parseltongue 
without knowing it that when he heard it, and spoke it himself, 
he must have thought he was speaking English. Odd though that 
may sound.

Goping back to the original question, I would add that come in 
Parseltongue must sound not too dissimilar to come in English, 
something like ssscossmess.