F. Scott Fitzgerald invented the reverse-aging phenomenon at the heart of "The Curious Case of Benjamin Button," which opened at movie theaters this week. But there are plenty of unusual ailments that are quite real. Here are just a few of them:

Foreign Accent Syndrome. Seemingly out of the blue, sufferers start speaking with what sounds like a foreign accent -- often of a country they've never visited. In one noted case, a Norwegian woman developed a German accent after being hit by bomb shrapnel in 1941. Neighbors suspected...