Answer:
the only amusing part of the body
I think you live beneath a roof that is upheld by me; I think you seldom walk abroad but my fair form you see; I close you in on every side you very dwelling pave and probably I'll go with you At last into the grave.
If I drink I die. If I eat I am fine. What am I?
What goes up but never comes down?
To cross the water I'm the way. For water I'm above I touch it not and truth to say I neither swim nor move.
No matter how little or how much you use me, you change me every month.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic