When I started flying at UND, we had a contract with the Chinese government to train their pilots (they were the only ones that could afford the Beechjets). A buddy of mine was up one time when the tower at Grand Forks just cleared everyone out of the pattern because a Chinese student couldn't understand his clearance. All he could say was "roger", but he never deviated from his course to the airport.
Another time, a Chinese student had an engine issue and landed off airport. As he was on the phone with the SOF, he figured out that the plane would work if the fuel pump was on, so he told the SOF that he would be taking off, then hung up as the SOF is screaming at him not to take off again. He stopped a car on the road and had the driver stop any traffic on the road so that he could leave. He was deported shortly after he got back to GFK.