normal or nuts?

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we are human, flawed and colorful in our own way.how can you distinguish the unsual and usual behaviours?this is only my idea coz i obesrved someone here in our place i dont know if he is normal or not (nuts). this is the story about him..this teenage boy drive him crazy when his food touching.he need a separate plates for the meat, the potato,the vegetables and diferent fork too.her mother is irritated and annoyed to make all those arrangements him. so can you tell?