The two-way mirror - a cruel useless plot device

[alcuin74]

No: HPFGUIDX 163708

> Lynda:
> 
> So
> he gets this two way mirror as a gift from Sirius and pretty much 
forgets
> about it. 

Alcuin:

That to me is one of the most unbelievable things in the whole 
series.  Given how close a connection Harry and Sirius had forged, 
there's *no way* Harry could have forgotten about that mirror.  
Imagine your very best friend giving you a cell phone before you leave 
for a 6 month trip, saying "Call me anytime on it."  Who among us 
would forget we have the phone?  That's one point where I simply can't 
suspend disbelief.  JKR really goofed on that one.  If I were Harry I 
would have been chatting it up with Sirius every day through the 
mirror.