Answer:
I jump when I walk and sit when I stand. What am I?
Send poorly behaved children to me and let them sit here.
I am used when you jump off a bridge for fun.
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?
When you stop and look, you can always see me. If you try to touch, you cannot feel me. I cannot move, but as you near me, I will move away from you. What am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?