Bingham et al

In the 1920s, three Englishman were traveling separately by train through Peru. At the time of their introduction, they were the only three men in the railroad car. Their introductions were more surprising than they could have imagined. One man's last name was Bingham, and the second man's last name was Powell. The third man announced that his last name was Bingham-Powell. None were related in any way. (Source: Mysteries of the Unexplained)

Well, it could be explained quite easily if the third guy was lying.