Arachibutyrophobia is the fear of having peanut butter stick to the roof of your mouth. Sufferers of this bizarre phobia will begin sweating, the roof of their mouth will become itchy and coarse, and may even suffer a convulsion at the sight of this creamy treat. Where does this irrational fear come from? Maybe a friend or family member choked on peanut butter in the past, or perhaps the sufferer grew up on a vigorous diet of PB&J that ultimately led to such a fear.