User blog comment:DonyarktheKungFuMinion/Old Man McGucket: Crazy or Smart?/@comment-8158935-20130418153954/@comment-108.7.202.206-20130419054038

Ya he probably does. As I said before in reply to Jrsushilover7 my theory is that:Old Man McGucket used to be this super smart sane guy who found gravity falls weird and wanted to discover its mysteries (like dipper). He then joines the secret society, but soon discovers that the secret society doesnt want anybody finding out about gravity falls secrets in contrast to what he beleived. He then quit the secret society and made book 1, 2, and 3 to show it to people. But he soons discovers bills the leader of the secret society is tracking him down. He then hides the books and finnaly cracks down under fear that "he" (bills) would find him and becomes crazy for the most part becoming the Old Man McGucket we all know and love.

PS. If you dont know about bill and the secret society look at this

There are 12 cryptograms in Rumble's Revenge.
 * Take all the capitalized letters from the decoded messages together and you get: "MY NAME IS BILL"