Offtopic:
Uitleg baan van de kogel:
A bullet from a Kalashnikov rifle weighs only about 5 g but leaves the rifle traveling at over 1,500 mph -- twice the speed of sound. This gives the tiny bullet the same amount of energy as a brick dropped from the top of St. Paul's Cathedral, so no wonder bullets tend to kill people.

If there were no atmosphere a bullet fired up into the air would come back down with this same amount of energy, and patently lethal consequences. However, air resistance makes a big difference and cuts the final speed of the descending bullet to around 10 percent of the muzzle velocity, or 150 mph, and its energy is the equivalent to a brick being dropped on your head from the height of four feet or so.

Experiments conducted with real falling bullets have confirmed that this is enough to cause significant injury and there is anecdotal evidence that they may be lethal. The victims are unlikely to be those doing the firing, however. Traveling thousands of feet in the air, the bullets are usually caught by the wind and land as much as a quarter of a mile away from the gun-toting loons who fire them.