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

In Let the Right One In (orig.: Lat den ratte komma in), after Oskar found out about Eli's true nature and let her into his apartment he asks her: Oskar: Who are you? Eli: I'm like you. Oskar: What do you mean? Eli: "What are you staring at? Well? Are you looking at me? So scream! Squeal!", those were the first I heard you say. Oskar: I don't kill people. Eli: But you'd like to, if you could...to get revenge. Right? Oskar: Yes. Eli: I do it because I have to. Be me, for a little while. Please... be me, for a little while. But I don't understand what she means with her last words. What does she want to say with "Be me, for a little while"?
What does Eli mean with the words "Be me, for a little while"?

In Game Of Thrones Season 4, the wildling Craster leaves his sons, from his wives (at the same time his daughters), into the woods to be taken by the White Walkers' king, after that he turned them into new White Walkers. I tried to figure out the reason behind this event, but no clues. So, What is the story behind this action? And why does the White Walkers' king need those new born babies?
Why does Craster give those sacrifices to the White Walkers?

Having seen Jack Reacher, and not having read any of the Lee Child books upon which the film was based, I was surprised by the amount of humor in the film. These elements reached their nadir with a bizarrely slapstick scene involving an attempted murder with a baseball bat in a bathroom. I know a little about the books and character, and was surprised by the inclusion of a scene like this (plus other comedic asides). Is this tone true to the book series, or did Christopher McQuarrie deliberately change things up through his script and direction?
Are the comedic elements in the film Jack Reacher evident in the novels on which it was based?