The reason why a cat runs wildly in surprise may be because it is happy, frightened, or has dirt attached to its body. You can wait until the cat's mood eases slightly, then comfort and pet the cat appropriately. Cats love to be clean very much. If you find something dirty on your cat, you need to help clean it up. Sometimes cats will behave this way when they are not feeling well. The owner should take the cat to the pet hospital for examination and treatment in time.