A fellow fires a 0.50 cal gun at a distant, unseen target. A few
moments later, the returning bullet skips off the ground in front of him
and nicks the shooter in the side of the head! There is a bit of
discussion about whether the video is a fake, but even if it is, it
offers a visceral intro to scattering. Students immediately recognized
that the target would have to be heavy and hard - the same thing
Rutherford concluded.