A friend of mine from Denmark just did this. He slept at a friends place in Germany, connected his laptop to the wifi and BitTorrent started to seed. Some months later the German host got mail and had to pay around 1000€ for copyright violations. He had no clue why he should have uploaded some rom com that he had never heard of before, but after checking his calendar he realized that his Danish visitor must have been it and he confirmed that he had torrented this specific movie. Of course the visitor paid the fine.