An earworm...

[davewitley]

Iggy:

> > For some reason, the address "16 Charing Cross Rd" in London 
popped 
> into my head a couple of days ago and my brain won't let it go 
until 
> I figure out why.  

Erin:

> Well, this is no help probably, but I also recognize Charing Cross 
> Rd.  Not sure about the 16.  Is it something from HP?  Where is the 
> Ministry of Magic?  St. Mungos?  Darn, now I have to look this 
stuff 
> up...

The canon reference is POA, which has the Knight Bus driving along 
the Charing Cross road just before Harry is dropped off at the Leaky 
Cauldron.

As for the earworm, there was a movie with the title "# Charing Cross 
Road" (where # stands for a number, but I can't remember what it 
was).  Could that be it?

David