You profess yourself able to show any one what he never saw, what you
never saw, and what nobody else ever saw, and which, after you two have
seen, nobody else ever shall see.
After requesting the company to guess this riddle, and they have
professed themselves unable to do so, produce a nut, and having cracked
it, take out the kernel, and ask them if they have ever seen that
before; they will of course answer, No; you reply, neither have I, and
I think you will confess that nobody else has ever seen it, and now no
one shall ever see it again; saying which, you put the kernel into your
mouth and eat it.