Answer:
The man who made it didn't need it. The man who bought it didn't use it. The man who used it didn't want it.
What kind of room has no windows or doors?
What has three ways out and just one way in?
Break it and it is better, immediately set and harder to break again
I'm not man's best friend, I'm their enemy, I can mark your end, yet you do not see me, I am very small, but very tough, If you have me, then you have it rough.
Often cooked as fillet, this meat comes from an animal that swims underwater.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?