Why DID Sirius laugh? (was: Peter Pettigrew, questions)

[cubfanbudwoman]

No: HPFGUIDX 101414

Phil Boswell wrote:
> Still not certain why Sirius would have just sat down and laughed,
> however ...


Siriusly Snapey Susan:
Yes, PLEASE, will people weigh in on this one??  It's never made 
sense to me either.  Was it just that Sirius was laughing in an 
ironic sort of, "I can't BELIEVE this is happening to me?" kind of 
way?  It was always described as sort of maniacal, though....

It seems to me that the report of Sirius laughing after the blown-up 
street always weighed heavily against him, and even when we did 
discover his innocence, it's not one of those things which instantly 
made sense in light of the new facts.  Why WAS he laughing?

Siriusly Snapey Susan