Feelings...Inside My Head

First of all, I love the song "Those Words Are Not Enough" by Relient K. Such a good song. The opening line is "Feelings...inside my head" thus my title.
Anyway. So I've been thinking about psyciatry and I just thought this picture was hilar!
Do insane people know they're insane? Do they ever wonder if they should stop talking to themselves??? Am I insane if I sometimes yell at myself? Doesn't everyone talk to themself????
Is it weird for sane people to want to be insane?