Since we are all (theoretically, for me) better versed in the art & science of weapons than the average movie screenwriter, I thought let's put down some funnies as seen in the movies related to guns. The obvious choices like MGs with unlimited ammo, etc..... and then some....
Inspiration: Was watching Anaconda III last night (son wanted to see..... can't help!!)..... apart from the rather evidently "plasticky" snake, and the overturning of scientific fact, what set me laughing aloud was the stupid choice of weaponry.
You are chasing a snake as big as a T-rex, genetically modified to be altius, fortius, strontius........ and you choose a Heckler & Koch MP5

(at least that's what it looked like!!). 9 mm SMG, which is not used even on humans at anything more than a few feet...... and you shoot a fast moving target from a fast moving vehicle over uneven terrain with Hollywoodian 100 round per second bursts!! My son was rather pissed off at me for laughing at rather awkward moments (like when people are swallowed whole by the super snake!!).... No one had a BAR or BMG?