Via Doug Berman, a Third Circuit case here (pdf) involves a defendant who based an insanity defense on dissociative identity disorder. According to a forensic psychiatrist who testified,
Doug poses what might initially seem like a Kripkean riddle: "[H]ow exactly could the forensic psychiatrist know that the 'Jasper' alter personality was a chimp and not, say, a gorilla or a baboon?"
But of course anyone who's ever actually hung out with chimps, gorillas and baboons wouldn't ask such silly questions.
Anyway, I strongly suggest any rock bands trying to come up with a name adopt "Jocko Killed Marti." You'll be huge.