Is anyone aware of another study nearly identical to this one?
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The study you mention was described by Malcolm Gladwell in Outliers, but we white Southerners come off a little better than in the scenario you describe. The provocation was not only being bumped, but also being called an asshole; and although our lot demonstrated a higher level of physical agitation after the fact, I don't believe anyone ever came to blows.
-- "Hige sceal þe heardra, heorte þe cenre, mod sceal þe mare, þe ure mægen lytlað."