A man decides to walk from point A to point B.
A god waits in readiness to throw up a wall blocking the man's further advance when the man has traveled 1/2 mile.
A second god (unknown to the first ) waits in readiness to throw up a wall of his own blocking the man's further advance when the man has traveled 1/4 mile.
A third god... and so ad infinitum.
It is clear that this infinite sequence of mere intentions (assuming the contrary to fact conditional that each god would succeed in executing his intentions if given the opportunity) logically entails... that the man will be arrested at point A; he will not be able to pass beyond it, even though not a single wall will in fact be thrown down in his path.
(Bernardete 1964, in "A Brief History of Paradox" p.56)