Answer:
I am the best thing that can happen after a stick hits a ball.
I am the noise Santa's reindeers make
cats and deflation tires make this noise.
What is easy to get into, but hard to get out of?
I am free the first time and second time but the third time is going to cost you money.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.