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 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]: In Mission: Impossible - Fallout (2018), Ethan Hunt's team already strap a tracker block on Lane's neck which makes the tracker device to show "no signal".    Why did Hunt's team set a 90 seconds limit to take out the tracker from Lane's neck?
[EX A]: Why did Hunt's team set a 90 seconds limit to take out the tracker from Lane's neck?

[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"