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

This question is about "End Times", the twelfth episode of the fourth season of Breaking Bad.  When Jesse learned that Brock had been poisoned, he came over to Walt's house to confront him. Walt opened the door holding a gun in his hand.   Even though Jesse was obviously mad at Walt, in a couple of minutes Walt left his gun on a couch and walked away, which allowed Jesse to hold Walt at gunpoint using Walt's gun.   Was that intentional?
Why did Walt leave his gun on the couch when Jesse came to confront him?

Was Galaxy Quest just a parody of Star Trek and related Sci-Fi tropes or were the lead characters in Galaxy Quest poking fun at certain actors in particular as well?   I remember reading something like William Shatner regretted his role as Captain Kirk for some time, until Patrick Stewart compared the role to Shakespeare. That is evocative of Alan Rickman's character at the start talking about how he used to be a real actor.
Galaxy Quest a parody of Sci-Fi/Star Trek only or specific actors too

I have always wondered what techniques directors use to get amateur actors, especially young ones, to cry. How can someone surrounded with so many film crew and cameras can concentrate enough and feel so sad that s/he can possibly burst into tears? In general, is crying in a movie scene (with real tears) something that can be learned by practice or is it something that only talented people can perform?

What techniques are used by directors to make an actor cry?