When David was younger we used to clash a lot.  When he was diagnosed with Asperger's and I learned more of the matter I realized why, he didn't like to do what I liked because he was either not interested or he didn't understand.  When he started school and over the past few years I noticed that he has taken a strong liking to science and I was able to use that to get him interested.  He now knows the physics involved with baseball and we both love looking at the stars, mom looks at the stars too but me and David like to quiz each other on what we see when mom chirps in "What is that over there David."  David naturally says "That's Sirius, geeze I can't believe you don't know that yet, it is straight across from Orion's belt."  He also has smart remarks for all the other questions.  When I ask him though he's like "Dad, I know you know what that is, you taught me."  David has taken a strong liking into it and we connect greatly through looking to the skies.  He doesn't realize though that his friends could care less about the stars at this point but he still insists on explaining everything to his friends.  He enjoys sharing his knowledge with all of his friends because they are so impressed by it (or don't care) and they tell him how smart he is and I think he enjoys being the smart geeky kid which I can relate to because I liked sharing my knowledge too and being that same kid.  David and myself get along a lot better now since he found out that I also have Asperger's and that I know what he's going through, and we both like to share each others interests now which makes it easier for both of us to enjoy what we do together.