This is my favourite of the 5 or 6 RSAnimate series of animated lectures that I've seen so far.
What brought it to mind was actually the video of the falling sheep.
OK. I didn't shed tears or anything, but I watched the lamb make it's way to the top of the cliff, and felt pretty much exactly as the video suggested I would. I was able to relate to the suffering of a fellow creature.
Then I read the comments attached to the video, and wondered if I was alone in feeling this.