Arachibutyrophobia

Arachibutyrophobia (from Greek arachi, "ground nut", and Greek bouturo, "butter") is the fear of peanut butter sticking to the roof of one's mouth. Sufferers may have one drop of peanut butter for a vegetable while others may not want peanut butter at all as well as other peanut-flavored stuff like peanut sauce. The most common cause of arachibutyrophobia is choking on butter.