Some fans of Game of Thrones (and even more so A Song of Ice and Fire) have a tendency to see secret Targaryens everywhere. Obviously theres the famous R+L=J theory, which posits that Jon Snow is really a Targ, but theres others as well. Tyrion is another commonly thought to be part-dragon, while others counter that by saying its really Jaime and Cersei who have Targaryen blood. Meanwhile the latest book offered someone who claimed to actually be one, but thats the one people dont believe. When Tyrion has a conversation with Daenerys in season 5, he tells her that shes the last of her blood. There may be at least a wink to the audience with this line, who know that there very likely is at least one more Targaryen out there, and it's possibly even the person delivering the line himself.