I take comfort in the fact that there are "idiots" everywhere.... so says the BBC:

"Since the average dealer now sits at a desk straight out of the Space Shuttle - and in many cases is relatively inexperienced and working under considerable pressure - mistakes are inevitable.
In May last year, London's FTSE 100 index dropped by more than 2%, after a trader typed £300m, instead of £30m, while selling a parcel of shares.
In 1998, in the biggest incident of its kind ever, a Salomon Brothers trader mistakenly sold £850m-worth of French government bonds, when he carelessly leaned on his keyboard."