Not just for guys, for girls too. Apparently there are more than a few Halle- Berry-Bond-Girl wannabes/fashionistas sporting that techie knife slung low across their bikini bottoms. :D
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I guess you were so busy thinking of a smart come back for a comment directed at someone else that you missed the part about the high stress situation. Your heart rate goes up. You loose control of your fine motor skills, you tend to fumble, and you tend to get tunnel vision. Oh, and check your math.