Answer:
I always follow you around, everywhere you go at night. I look very bright to people, but I can make the sun dark. What am I?
You throw me out when you use me and take me in when you are done. What am I?
You can see me in water, but I never get wet. What am I?
I cause involuntary movements in your vehicle
Two in a whole and four in a pair. Six in a trio you see. Eight's a quartet but what you must get is the name that fits just one of me.
The answer I give is yes, but what I mean is no. What was the question?