Step 20: The Head
I think this is because secretly inside, a lot of us really wish that we were animals instead of people. It doesn't happen often, but sometimes, once we've had a few drinks, and are in close proximity of a roasted pig head, this desire comes out for all the internet to see.
There's surely more to say about roasting pigs, but this is a good start, and I'll do my best to update the Instructable with all the good tips that I'm sure will come in as comments.
Best of luck on your pig roasting adventures and be sure to invite me - I'll be looking for the fork in my door.