I never get that. If you have that good aim and you somehow shot a gun from a man's hand, he would be seriously injured from the force of the gun flying off his hand, and material from the impact of bullet to just splattering all over him.

I saw a SWAT marksman do something similar on one of those real life police shows (Cops, Real Stories of the Highway Patrol, something like that) a long time ago.

You mean This video.
Or did you mean any other video?

Impressive shot, but that's not it. The one I'm talking about had the perp laying flat on his back on his porch with the pistol laying on his chest, and the cop shot it off with his own pistol from about four feet away.

Let's not forget another classic Hollywood firearm myth; the fact that any gun from a .38 snub-nosed revolver to an M60 machine gun can cause a car to explode if shot in the fuel tank. This was actually addressed rather comically in "Last Action Hero" when Schwartzenegger was plugging away at an oncoming car expecting it to turn into a fireball but was shocked when it kept on going. Two other movie weapon faux pas involve hand grenades; namely the mistaken belief that it's possible to pull the pin wih your teeth and not suffer serious dental injury, and that a that a High-Explosive Fragmentation grenade is supposed to generate an almost Hiroshima-like fireball upon detonating, instead of a roughly medium-size dust cloud and a few scattered puffs of dust from fragments impacting the surrounding area.

I don't know if this one qualifies, but as I'm sitting here watching Tomorrow Never Dies, I can't help but be reminded how when the hero takes an assault rifle or SMG from a dead bad guy he/she just killed, they never seem to bother taking any extra ammo!

Yeah.
The only exceptions I can think of are Blood Diamond and the first Die Hard.

Well apparently they don't need to cause they have unlimited ammo ( I mean Bond seems to have fired off at least 100+ rounds from a 30 round magazine )

Assault on Precinct 13, too. Ethan Hawke took the tac vest, ammo and all, off one of the dirty SWAT cops he killed (but for some odd reason didn't seem to have a use for the perfectly good night vision gear the baddy had, though... :confused:) and wore it all through the movie.

Sometimes night vision can be bothersome and there seemed to have been enough natural on screen light to make night vision pointless