I could say a few things about laughs. Almost feel like being funny right now, just to get one. Seeing/hearing others laugh; that feeling is contagious. And since it's teamwork, that makes it a perfect fit for any relationship.
You asked about it stopping. Laughter cannot be fake. If it suddenly stops, that can only be intentional. Takes effort to maintain disinterest.
You're an incredibly funny chap, I know this because you made me laugh many times so if you did something funny right now I think you'd get the intended response.
Your last lines...yep, I totally agree.