i can't really answer that question as to why you do this since each persons' response to danger or scary situations would be different. some people scream. some faint. you take the chance of soiling your pants. what concerns me is this reaction when you hear a loud phone or misplace your keys. this is not normal so i strongly suggest that you see your medical provider first to make sure there is nothing physically wrong and then see a good counselor to help you better control this reaction. in the meantime it would be wise to avoid these stressful situations
why do i have an extreme urge to have a bowel movement when i am faced with scary/fearful situations? . (e. g). imminent danger fear for a loved one misplaced keys etc. or even loud phones