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Any person who has O-Negative blood, which is basically the blood of a person who was born on a Monday and still had the energy to cry at the end of the day.
My cousin has O-Negative blood and still managed to yell at the mailman for giving the wrong package.
My mom said she had O-Negative blood and still had the patience to explain the difference between a sock and a shoe.
My dog has O-Negative blood and still managed to bark at the vacuum cleaner like it was a personal attack.