The creation of inside jokes/references very early on in the relationship that get referred to early on in the relationship. I'm sure this is pretty normal and falls under "building rapport," but it's something I just realized. I'm sure the reasoning is something like this: - Assuming the joke is funny to both of you, it means you both have the same sense of humor (a requirement for a good relationship). - Referring to inside jokes makes people feel happy (keeping her in good emotions or "good feelings") - Inside jokes also have a "special" feel to them, ie. you're the only two who understand it. This builds comfort in a similar way as a "conspiracy plotline" from MM. - They also refer back to a previous time (the creation of the inside joke) when you were both in good emotions. This causes the joke/reference to bring back those original feelings. I've also noticed this in a few cases with females who I was not in an LTR with, but with whom I was on the "same wavelength." This one girl I worked with was married, but we clicked instantly we were on the same wavelength about everything which lead to the creation of many inside jokes/references. In fact, she moved away a year or so ago, but we still email occasionally and our emails are still filled with these references. And it's funny... even with my first LTR of 3.5 years, a relationship that ended 4 years ago, when we occasionally talk nowadays, our conversation still refers to these inside jokes/references and it's always a good, happy conversation. Note - As I reread this post, I wonder if "inside joke/reference" is the right term to use here. If this sounds completely crazy let me know and I'll try to redefine or give an example of what I'm talking about.