Good Riddles

Question: Had by few but treasured by all,
I'm on the inside and outside and I make men fall.

What am I?

Question: A town only has one barber (he is male). The barber only shaves all of the people who do not shave themselves.

So who shaves the barber?

Question: You can rest on my pad without touching the keys.
I will sing all month long as long as you pay your fees.

What am I?

Question: I am a cave full of bones,
and the house of a worm.

What am I?

Question: A man is walking through the park one day and sees a group of four boys standing in a circle. A smaller boy is holding a large stick and hands it to a larger boy saying "I couldn't do it, your turn."

The larger boy swings the stick twice and the other two boys go to the ground. The smaller boy says "I'll get 'em next time." The man walks away smiling.

What just happened?