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Build Your Own Bluetooth Sniper Rifle
Jim Buzbee writes "I don't think I'd do it, but these guys built a Bluetooth Sniper rifle, went to the roof of a downtown Los Angles skyscraper and pointed it at nearby buildings. See what they found, and if you're so inclined, they'll show how to build your own and maybe, just maybe, you too can snag Paris Hilton's address book." (Which was not snagged via Bluetooth snooping, as the article points out.) This version looks a bit more polished than the one mentioned last August.
The above poster who replied is correct... shooting at an angle means gravity acts as a vector force.
Most urban police sniper/countersnipers I've know train specifically for high-angle shooting, because it changes the dope on your rifle (compared to a flat shot). I know one sniper who made his own nifty improvised protractor/plumb-bob setup that allows him to calculate the change in bullet drop very precisely.
Remember... gravity only acts on the horizontal component of the vector; your bullet travels on the hypotenuse.
Even if a man chops off your hand with a sword, you still have two nice, sharp bones to stick in his eyes.