The longest way to a correct answer is to first eliminate all the wrong
ones.

If you think your crazy then you are probably sane. If you know your
sane then you are probably crazy. If you are insane and know it then you
are probably normal.

I taught a man to fish. He taught his kids to fish. They taught their
friends to fish. Now the man is the CEO of the largest fishing fleet.
Now I buy fish from him.