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

[Q]: In spite of being one of the most hilarious voices in The Big Bang Theory, why was Howard Wolowitz' mother never shown?
[A]: Why is Howard Wolowitz' mother not shown in The Big Bang Theory?


[Q]: In the 1996 film adaptation of the Island of Dr. Moreau, starring Val Kilmer and Marlon Brando. Brando's character, Dr. Moreau, plays a duet with one of his deformed creations. What is the piano piece they are playing? What is the dramatic significance of the episode?
[A]: In the Island of Dr. Moreau (1996) Marlon Brando's character plays what piece on the piano?


[Q]: 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?
[A]:
Why did Walt leave his gun on the couch when Jesse came to confront him?