“It’s a trick. Get an axe.”
This line is one of the reasons I love Army Of Darkness. Instead of stupidly assuming a monster is dead, turning his back on it, and letting his guard down, Ash assumes that the monster is faking and won’t relax until it has been chopped into small pieces.
“Nuke the place from orbit. It’s the only way to be sure.”
Again, somebody who assesses the situation and proposes the logical solution.
But so many movies depend on inadequate safety precautions-
The germ warfare lab-
isn’t properly sealed.
Nor does contamination of the lab result in a total lockdown which can only be overridden from outside.
Nor does the lab have a system for sterilization of the entire premises in case of contamination.
The genesplicing monster making lab-
doesn’t have sufficient back up generators.
doesn’t have containment devices that work without electricity.
doesn’t have cages with bars close enough to prevent the experiments from sticking their arms/tentacles/whatever/ through/
doesn’t space cages far apart enough that a person can walk between them safely out of reach.
doesn’t have enough failsafe devices for sealing the entire lab and destroying everything inside in case of monster escape.
Think of Jurassic Park. If they had wisely decided to use reinforced concrete barricades instead of electric fences, no dinos would have escaped. If they had decided not to clone a poison spitting dino, or surgically removed their poison glands, no dinos would have escaped. etc.