Answer:
When will water stop running down hill?
I have a pet, his body is full of coins
Most people need it, some ask for it, some give it, but almost nobody takes it. What is it?
I'm a small ring shaped fried cake, often with bavarian cream or fruit filling, and sometimes covered in icing and sprinkles.
What comes down but never back goes up?
It is something you will never see again.