The young American diplomat is posted to Japan for the first time, although he speaks no Japanese. He's taken to a whorehouse by his new mates. Once in the sack, he gently inserts his dick and hears her say gently, "Machigatta ana". The Yankee says to himself, that must mean something good. He presses harder, and hears more forcefully, "Machigatta ana!" Thinking that this must mean "You're a stud!" or such, he commences to pounding the girl, who ends up screaming, "Machigatta ana! Machigatta ana!" He's pretty pleased with himself afterwards.
The next day, the diplomat is entered into a golf tournament with his Japanese hosts. On the first hole, the Japanese foreign minister makes a hole in one! The diplomat sees a chance to practice his Japanese, and remembering the encouragement from the night before, cries out: "Machigatta ana!" The Japanese foreign minister and all the other Japanese dignitaries turn to stare at him, and one demands, "What you mean - wrong hole" ?!