At points north we stopped to visit a teenage son. The son came aboard the motorhome. This particular son was not familiar to Bud, and furthermore, he was a smoker. As we chatted with him, Bud whined and moved around the cramped space in an agitated way. We reprimanded him and he retreated to parts unknown.
He was back within a few minutes, quietly using the litterbox and doing his usual snouting around in the litter material. We continued to converse with the teenager. Suddenly, Bud made his move against our unwelcome guest. With his weight on his hind legs, he put his front hoofs on the teen's leg, barked, and rubbed his wet litter-laden snout on the boy's jeans.
The kid leaped to his feet and retreated down the steps of the motorhome. Since that time, when the boy comes to visit, he sits with his feet and legs tucked under him when Bud is around. The pig gets respect from the teenager.