The man who invented it doesn't want it. The man who bought it doesn't need it. The man who needs it doesn't know it. What is it?

Answer: coffin

More Difficult Riddles with answers

More Difficult Riddles

The moon is my father. The sea is my mother. I have a million brothers. I die when I reach land
The more holes you cover the lower it goes.
The more of them you take, the more you leave behind. What are they?
The more you take, the more you leave behind.
The older they are the less wrinkles they have.
The ones who see it may go blind, Contracting the fool's madness. You have to dig to find it, Crush big stones or mine it. Wash dirt clumps in a pan and wait for it to settle, A shiny, precious metal.
The person who makes it has no need for it. The person who purchases it does not use it. The person who does use it does not know he or she is. What is it?
The root tops the trunk on this backward thing, that grows in the winter and dies in the spring.
The sharp slim blade, that cuts the wind. What is it?
The stack just might be sent all over. Full of what's new, yet it's nearly obsolete.
The title of the problem tells you how to approach these four questions. (A). A bus leaves Moscow for Tula at noon. An hour later a cyclist leaves Tula for mosco, moving slower than the bus. When the bus and cyclist meet, which one of the two will be farther from Moscow? (B). Which is worth more: a pound of $10 gold peices or half a pound of $20 gold pieces? (C). At six o'clock the wall clock struck 6 times. Checking with my watch, I noticed the time between the first and last strokes was 30 seconds. How long will the clock take to strike 12 at midnight? (D). Three swallows fly outward from a point. When will they all be on the same plane in space? Now check the answers. Did you fall into any of the traps which lurk in these simple problems?
The weapon of choice to create the biggest shock.