OK, I do love geeking out on epic manufacturing scale, but there's not a lot of surprises in this video.
1) Melt wax, add colours
2) pour in mold
3) label crayons
This screencap looks like the happiest cigarette factory on earth, though:
I think I've linked this here before, but I enjoyed it so much that I'll do it again! NatGeo Lego Factory doco: