Diary, map and Arthur Weasley's warning

[Peter Felix Schuster]

No: HPFGUIDX 88815

Hi there!

The discussion about the Marauder's Map reminds me of a speculation I 
had. At the end of CS Arthur Weasley reminds Ginny that one shouldn't 
trust a thinking thing when one cannot see where it keeps its brain. 
At that time the warning couldn't help anymore. Harry remembers this 
when taking the Marauder's Map - which turned out to be trustworthy.

Now my theory is that those were hints for a plot yet to come. A 
thinking thing not trustworthy.

Where does the Sorting Hat keep its brain anyway (since I believe it's 
trustworthy it should be visible somehow)?

Bye Peter