When I was a little kid, I saw a "3-2-1 Contact" episode where they described the dangers of doing drugs. Apparently, crack can make your brain replay events after they happen. They used the example of going on a roller coaster and then experiencing it again...and again...and again.
Well, it turns out that my brain does this naturally, and I'm wondering if it's an N thing. My brain especially likes to go over what's been said or written. It doesn't replay roller coaster rides, thankfully.