Answer:
What is black when it's clean and white when it's dirty?
I have a ring but no fingers. I used to stay still all the time but nowadays I follow you around.
No matter how hard you hit me, no matter how much I hurt, I'll always go for a laugh. What am I?
I go in hard, come out soft. Blow me hard and I'll make a pop. What am I?
I'm really blue but when you see me I'm red. You don't see me too often. I'm there for you if you're hurt.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.