Placophobia: People who experience an unnatural fear of tombstones, are diagnosed as suffering from placophobia. Aichmophobia: It is an extreme and irrational fear of sharp or pointed objects like needles, knives or even a pointed finger. The phobia is also termed as thanatophobia and thantophobia. Ithyphallophobia: It is an abnormal and persistent fear of seeing, thinking about or having an erect penis; also called medorthophobia or phallophobia. Coprastasophobia: It is an overwhelming and persistent fear related to constipation. Auroraphobia: It is an exaggerated and persistent fear of aurorae