Hands up the dumbass with the fat fingers? It seems the sudden plunge in the US share market is being blamed on human error. Rumor has it some fat fingered buffoon entered a “b” for billion instead of an “m” for million during a trade involving Procter and Gamble. This simple mistake set off a chain of events that would make the toughest of traders weep. Yep, it was the largest intra-day plunge in the history of the Dow Jones Industrials average.