"Shoo!" I called, and the pig looked startled and jumped a bit. "Git!" I yelled, and waved at him. He turned and trotted away a few steps. I slowly walked toward him. "Come on, go home, pig! This isn't your yard!"
Slowly -- that pig is so fat I don't see it doing anything quickly -- he trotted toward the road, with me keeping pace behind him. If I stopped, he stopped. Once he went through a hole in the hedge and out onto the road, I decided my work was done and went back inside. I do wish I'd remembered to take a picture of this incident, however.