I just got done writing a chapter that doesn't really advance the plot of the present book, only planting seeds for a future story. In the chapter, the main character learns that his friend, at one point, had a sister who died and he blames himself by speaking remorsefully. I remember reading somewhere that unless a chapter either a) advanced the plot or b) developed a character, then it was pointless. I don't think that chapter is wholly pointless in that we do learn a bit about the main character's friend and (hopefully subtlely) forshadowed a future story that details this tragic moment in the character's past as a sub-plot. Of course, I also heard that it's better if executed properly. The way I did was via the main character waking up to a tapping sound. He searches for the source, can't find it and asks the friend who momentarily flips out going, "I've done it with her many, many times and I'm not going to do it with you!" (It takes place during the night, and the friend concludes that the main character is afraid of the dark/being alone.) At the end, the friend calms down and mutters to himself saying, "I...I can't. I can't." before telling the main character to just go to sleep. I don't know if it's too obviously a forshadowing or not. My instincts tell me it probably is. So, what are your opinions?