" What do you think it’s like, Father?” “What what’s like?” “Being crazy. Mentally ill.” “Well, they never know they’re ill, do they? You can’t diagnose yourself with the same organ that has the disease, just like you can’t see your own eyeball. So, I suppose you just feel normal and the rest of the world seems to go crazy around you. "

― David Wong , John Dies at the End (John Dies at the End, #1)