To be fair, the potential consequences of a market trade -- or even a feint at a trade, as a certain proportion of HFT trades are widely suspected to be -- can

To be fair, the potential consequences of a market trade -- or even a feint at a trade, as a certain proportion of HFT trades are widely suspected to be -- can be far greater (and more difficult to predict) than those of doing a Google search, or changing the TV channel from the comfort of your sofa.