Been there, done that. Car busy overtaking me moved in to let an oncoming car passed. He pushed me into a wing mirror of a parked car (which i ripped clean off), then continued to drive away. Turned the front wheel into the drivers side wheel arch, bending my wheel to 90deg in the process, which stopped the bike moving and sent me flying (on looker reckoned 10-15 feet) onto my head. One trip to hospital for a busted head and a fit nurse later I was back at work. And the lesson, wear a helmet.