Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

[EX Q]: In Suicide Squad (2016), there is a scene where    Harley remembers jumping in what looks like acid containers, followed by Joker. We later see them kissing there, with blue and red paint melted around them in what should be acid, but looks more like milk, and the two of them seem unharmed.   What is the significance of that scene? Was it the final test of Harley's loyalty to Joker and it was never acid in those containers, but only made to look like it was, or am I missing something deeper here?
[EX A]: The acid scene in "Suicide Squad"

[EX Q]: In the movie Predator (1987), why did the predator come to Earth? I only know a little bit about Predator lore/fandom. Was he hunting for a rite of passage? Was he already an established hunter and just hunting for more trophies? (These are just guesses of mine)
[EX A]: Why did the first Predator come to Earth?

[EX Q]: I've been watching season 1 of 24 for the third time, and trying to work out if Nina's behaviour does add up to the season's final plot twist.  This question pretty much explains everything: Why did Nina Myers help Jack Bauer if she was a mole?  However, in episode 22, while Jack is being held hostage by the Drazens and Chapelle refuses to do anything about it, Nina unexpectedly calls Palmer and asks him to help save Jack.  Now, I really see no reason for her doing that! She can just let things happen and continue to do her job, her employer's plans are succeeding and Jack's killing was part of it.  Is there any consistent explanation as to why she would go out of her way when she obviously didn't have to?
[EX A]:
Why does Nina Myers call Palmer in episode 22 to help save Jack from the Drazens?