There's a tale circulating on the Internet about a verbal gaffe Japanese Prime Minister Yoshirou Mori made with U.S. President Obama. The problem is...Mori isn't the Prime Minister anymore!
To read the story, and Snopes' investigation of it, check out "Who Are You?" on Snopes.com.
Although Prime Minister Mori had his fair share of verbal faux pas while in office, this particular conversation never took place. Mori was only in office from 2000-2001, and we've seen 6 other prime ministers since then. The current Japanese Prime Minister is Shinzou Abe, and he has also never had such a fumbled conversation with the current U.S. president.