Answer:
I can move even when you are still. I can be one or many.
who do you think you know but sometimes you don't
What can be swallowed, But can also swallow you?
Two in a whole and four in a pair. And six in a trio you see. And eight's a quartet but what you must get. Is the name that fits just one of me?
Don't do this in the shallow end.
When is it bad luck to see a black cat?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?