Repete, your question about fatalities caused me to do some looking for actual statistics.
Wikipedia say that on "July 22, 2003: More than 20 people were reported killed in Iraq from celebratory gunfire following the deaths of Saddam Hussein's sons Uday and Qusay in 2003".
A link about the same issue.
http://www.cbc.ca/news/reportsfromabroad/middleeast/2008/04/deadly_merriment_the_fallout_f.html
Also, this quote from Wiki simply explains how many of these deaths occur, which is not the result of a bullet falling at an angle perpendicular to the horizon at terminal velocity. The last sentence explains what happens when the bullet is not coming straight down.
"Bullets fired into the air usually fall back at terminal velocity, speeds much lower than those at which they leave the barrel of a firearm. Nevertheless, people can be injured, sometimes fatally when bullets discharged into the air fall back down. The higher mortality is related to the higher incidence of head wounds from falling bullets. Fatality accrues, when the firearm is discharged at an angle, thus the bullet keeps its angular ballistic trajectory, and falls at a speed faster than at terminal velocity."
In other words, when a bullet "keeps its angular ballistic trajectory", the bullet never reaches zero velocity and zero spin at any point in its trajectory as it would if it was fired at an angle perpendicular to the horizon.
Still, a 30 caliber slug on the top of the head moving at terminal velocity for that bullet and all of the variable conditions present at the time would not be a pleasant thing. At least for me it wouldn't be, but maybe I'm a wuss that worries too much about blood loss, damaged tissue, and related things.
