In that video, a woman with the condition attempts to answer some simple questions and perform a few tasks. She alternates between being able to answer with ease and sounding like a breakdown in an old school hip-hop album.
Again, if you didn't know English or turned off the sound, you'd think the lady was speaking normally. Everything about her body language, inflections and facial expressions indicate that she's perfectly comfortably engaged in conversation with her granddaughter about the good ol' days. She's not confused or frustrated or stumbling over words. It's not until you turn up the volume and hear the almost Tourette's-like sounds coming out of her mouth that you realize anything is wrong. People who've recovered from it say it was like their mouths just took off on their own -- they didn't know what they were about to say or understand what they were saying once it started.
So it joins schizophrenia and narcissism on the list of "mental illnesses that can help your political career."