Cursing increased pain tolerance amongst participants, who lasted longer than when they said a common word. While psychologists haven't established why, they believe "downplaying feebleness in favor of a more pain-tolerant machismo" unlocks something in the brain, perhaps the same thing that long ago helped us survive fights with other cavemen by getting good and pissed off the first time they hit us with a rock. They also noted cursing starts from the more emotional right brain than the uppity school boy left brain, where most language occurs and the parties are all boring and shit.
So the next time you bang your shin on an open desk drawer at work and involuntarily scream "FUCK!" at the top of your lungs, explain to your boss that you were just dealing with your pain in the most readily available way possible and that none of this would be happening if they didn't demand that you stop popping vicodin at work. Then show them this article to back up your point.