  In a recent paper, \.Zukowski and Markiewicz showed that Wigner's Friend
(and, by extension, Schr\"odinger's Cat) can be eliminated as physical
possibilities on purely logical grounds. I validate this result and demonstrate
the source of the contradiction in a simple experiment in which a scientist S
attempts to measure the position of object $|O\rangle = |A\rangle_S +
|B\rangle_S$ by using measuring device M chosen so that $|A\rangle_M \approx
|A\rangle_S$ and $|B\rangle_M \approx |B\rangle_S$. I assume that the
measurement occurs by quantum amplification without collapse, in which M can
entangle with O in a way that remains reversible by S for some nonzero time
period. This assumption implies that during this "reversible" time period,
$|A\rangle_M \neq |A\rangle_S$ and $|B\rangle_M \neq |B\rangle_S$ -- i.e., the
macroscopic pointer state to which M evolves is uncorrelated to the position of
O relative to S. When the scientist finally observes the measuring device, its
macroscopic pointer state is uncorrelated to the object in position
$|A\rangle_S$ or $|B\rangle_S$, rendering the notion of "reversible
measurement" a logical contradiction.
