lycranthrope
A lycra-wearing cyclist who shape changes into a bicycle-riding wolf when there's a full moon. They then randomly break off wing mirrors and shout abuse at motorists who they think have wronged them.
The other night I was just minding my own business, sat at the traffic lights, and some passing lycranthrope broke off my wing mirror and implied that I indulge in self-abuse! Must be a full moon again.