"Stranger than usual" could be an evidence for not being the real Dumbledore, but instead Voldemort's imaginary Dumber-dore. We were already shown in the chapter that Voldemort had a wrong model of him.
(Maybe acting like insane was Dumbledore's long-term strategy to prevent his enemies from simulating him precisely. But that seems rather paranoid. On the other hand, he sometimes works with Moody.)
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 110.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: