I once heard about someone who had an alarm system that would page them as well as take a picture of the inside of the car every 5 seconds if it were broken into, which was unlikely because he had installed bullet-proof glass windows and had removed the handles and locks on the doors, relying entirely on the remote keyless entry. He acknowledged that if he were ever in an accident and rendered unconscious rescue workers would have a hard time removing him, but he thought it was worth it.