Many of us lucid dreamers have surely tried several reality checks in a dream, they work but not always. In a dream you can manipulate the physics, create or summon people,things and etc but when your dream is strongly built of sheer reality, it is not easy to be broken.
I have had several lucid dreams in which I tried the reality checks, they did follow the physics so it prevented me from realization of my dream. Trying to get my hands through a wall, spinning my ring, trying to levitate on the air, checking my digital watch twice... they acted just like they do in reality. Not only the aforementioned checks followed the rules, the surroundings were empty of abnormalities as well.
Have you ever had such complications in your dreams?