Pharsaphobia

Pharsaphobia (from pharsa, Greek for "prank") is the fear of pranks. The phobia is almost exclusively suffered by children, commonly caused by being told of practical jokes that they think is real and scare them. They would stay away from people that may prank them. On April 1, which is April Fools' Day, sufferers would hide themselves from anybody as people commonly do pranks on April Fools' Day unless if they show to people who trust not to do pranks on them.