Watching Your Parents

Did you ever know watch your parents to know when things were turning south? Like for instance, I remember a time when we were on a plane that had a very bad landing. But my parents were cool and calm and my brothers and I didn't think twice. Until they said something about it later, and I realized all was not okay, they just made it seem like it was.
To this day if I see my dad grip the steering wheel or act in some other similiar maneristic way, I start to get nervous and feeling sick to my stomach. Even if I have no clue what is going on. I know he isn't feeling well or there is something wrong.
I can tell the same thing by the tone in my mother's voice or the phrases she chooses in her speech. Same with my grandparents. Instantly still, I change too in a matter of seconds.
Even if I don't know of any threat or problem.
I'm generally calm. I'm just saying. Don't you experience the same thing? In an instant?