Suppose you have a source of electron antineutrinos, and you arrange your apparatus so that a billion billion billion of them collide directly with a black hole. In principle, you could measure the change in momentum and energy from that occurrence. Suppose you did that the next day. According to current theory, would you always get the same result? Suppose then you back off a few miles and do the experiment again, with the same number of neutrinos. Would your measurements give the same energy and momentum change as the first time?