Applicability: An existential threat to humanity requires the government to mandate dress codes across the country to protect the population, though there is some resistance from those who don't want the government interfering in their wardrobe choices. Are we talking Schedule Bare-Back (and later, Schedule Sun Tan) enforcing public nudity in The Puppet Masters, or the COVID-19 Pandemic requiring everyone to wear face masks?
Values Dissonance: The heroes are first able to recognize men who have been taken over because they show no interest at all in Mary, a top-quality Femme Fatale. It doesn't seem to occur to her that they might be gay, or asexual. For that matter, they might be straight but just not attracted to the kind of woman that Robert Heinlein prefers.
Just about every possession can bring the waterworks.
Alex possession near the end is one of the worst. What makes it really bad though? He probably didn't survive the parasites removal since he'd also been shot several times.
Sam: Alex, man, fight it! Fight man! Fight it! Alex: (aliens reassert control) How could he, Sam? You couldn't!
