My wife's cousin tried buying cigarettes at CVS and they wouldn't sell them to her even though she was like 20 at the time and had ID. The problem was, she's like 4 feet tall and really young-looking, especially when she doesn't have makeup on which she didn't at the time.
IIRC they made her leave because she kept yelling about how they were "trampling her rights".
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Black Turtle spilled my diet soda!