found the referenced youtube video today when looking at another video on sword and buckler posted here. around 02:47 into it, they show an example of the 'slow' cannonball effects i mentioned earlier in this thread. kinda gory. whole video is educational. lotsa nice arms, sharp pointy things and things that go boom.
HD Battle of Camden
from 'the Patriot' (best at 720p HD & full screen)
edited: today must be cannon day. found this article:
Cannon ball fired thru home
kinda off topic, but does show the odd bounces they can take.