I used to see Mad Dog heaps in the city when I used to work at Hungry Jack's. He used to keep us amused by yelling at strangers in the car when they were parked at the lights "arrrrrrrrrrrrrrrrrr!!!!", window shut or not, didn't matter.
I used to see him about 9 yrs ago on Guildford Road, Bassendean, pedalling at about 70k's/hr, bare feet and growling. He hasn't changed a bit. I described him to my husband and he knew straight away who he was, from his apprentice years in the city.