“I’ve learned that people will forget what you said, people will forget what you did, but people will never forget how you made them feel.”
– Maya Angelou

Kyle says how people make you feel is up to you. There is no property of human action which invests in it the ability to effect the chemistry of your brain. … You thought "never forget" was going to have something to do with 9/11, didn't you? And how did that make you feel?