The best part about this is that you can forward it round your office and then laugh at everyones crap drawings. We are thinking about setting up a small pig art gallery in the corner of the office here.
Don't cheat by reading the whole thing first. It is hysterical if you do it right!
Get a blank piece of paper, draw a picture of a whole pig on it, not just the head, just a basic drawing though, don't spend too long on it.