OP - why exactly does this make you ashamed to be an american? You didn't commit any of the depicted acts, did you? If not, why do the acts of other people impact how you feel about yourself and the U.S. as a country? All countries include an enomous number of relatively irrational people. That fact doesn't mean (IMO) that a rational upstanding citizen of one of those countries should be ashamed of his affiliation with that country just because some dumb dumb that happens to be in the same country does something stupid.
As for Black Friday - like most here I feel that its a stupid activity. Nonetheless I usually find myself drawn out on Black Friday to people watch. In certain parts of the country (western VA, for example), there are some really interesting people that come down out of the hills to participate in the shopping festivities. For example, I once saw a whole family of hillbillies (4 full generations - grandparents, parents, kids, and grandkids), where everyone in the family was garbed head to toe in camouflage. Each of them also had some form of unnatural hair color (blue, green, pink, flame orange, etc). Observing those people is a bit like observing the elusive giant squid or Moby Dick - i.e., they are legendary both for their appearance and for the impression they make on people who encounter them.
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