Things to think about some more:
Moving through a 24 hour period, most people will identify something that they want to think about again, later.
Someone talks about a vacation they just took and you think, “Hmmm, I should talk about our summer vacation with my spouse.”
Someone mentions a seminar/conference that they attended, and you think, “Next quarter, I need to look into attending a trade conference.” Someone on the subway has a book they’re reading, and that makes you think… you get the point.