Just thinking about this, make sure you report it to the police. They'll never catch the person but adds to their stats another unsolved crime and highlights scumbags being rife in the community. They'd prefer you didn't report it because they're very unlikely to solve but I always would. Especially as when you watch the news and they talk about types of crime reducing, too often I think no, people just don't bother reporting as much as they know it won't be solved... Which is definitely not how it should be...