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You think the action in Procter & Gamble was weird, check out the nosedive on Accenture, which plummeted from above $40 at 2:47 p.m. to $0.01 at 2:48 p.m. Had demand for consulting services declined so sharply in that one minute?

Obviously there was some sort of technical snafu out there. Still, it seems that the worries in Greece were seriously worsening Thursday. So how much of that scare was robots gone wild and how much was sensible worry from flesh and blood investors? We'll have to wait and see, though we did close down more than 3% on the Dow.