Answer:
Poor people have it. Rich people need it. If you eat it you die. What is it?
Whipping one of these out in the wrong setting is said to be terrible luck.
What can be measured but has no length, width or height?
What word do all dictionaries spell wrong?
What has feet on the inside but not on the outside?
Two little holes in the side of a hill. Just as you come to the cherry-red mill.