Answer:
Whoever makes it tells it not. Whoever takes it knows it not. Whoever knows it wants it not
I am free the first time and the second time, but the third time is going to cost you money. What am I?
Why did the computer keep sneezing?
What can be as big as an elephant but weighs nothing?
What bone has a sense of humor?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.