For me it is falling. I have a very bad ankle, and I am normally kind of clumsy.
Not precisely a fear, but I have a realistic concern for my children* based on ethnicity if a rabid or prejudiced person encounters them. My wife and I raised them right, I do not think that they would do anything that would or might warrant anyone to visit misconduct upon them, but as many instances have already shown, there are some people who harbor that provocation within themselves and need no valid excuse to create victims. Unfortunately, certain police officers or other authority figures are included in that probability.
*My children are biracial; I am Black and their mother is Asian. They are not seen as Asian nor as half Asian nor as part Asian. They are seen as Black. Before any of you respond that color-blindness exists, please understand that it is not universal. If and when any person wants to consider race or ethnicity as an identifying factor, race and ethnicity exists in that situation or circumstance.
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