A full bladder is roughly the size of a softball, and can hold about 12-16 ounces of urine. When your bladder contains about 8 to 10 ounces of urine, you will normally feel the urge to urinate. Apparently, legendary filmmaker Alfred Hitchcock took these statistics into consideration when making movies. "The length of a film should be directly related to the endurance of the human bladder," the director once noted.
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That little bit of info is courtesy of "why do men have nipples?" my page-a-day calender