Yoda is a Chicago cat with four ears. Valerie and Ted Rock found him in a local pub being "passed round by curious drinkers," hopefully not like that scene in Lynch's The Elephant Man. From the Daily Mail:
Yoda's extra 'flaps' are separate to the base of his skull, with one placed slightly behind the other. 'The vet had never seen anything like it before,' explains Valerie. 'He immediately went to the internet and found the four-eared cat in Germany...Cat with four ears (Daily Mail, thanks Shawn Connally!)
'We have spoken with other vets in our acquaintance, and they likewise had never encountered anything like this. Yet despite his unusual looks, Valerie is sure Yoda's behaviour - and hearing - are quite normal.
'Yoda's hearing is normal as far as we know,' says Valerie. 'People do a double take when they see him or his picture. It is great fun showing him off.