Rolls-Royce retracting hood emblem. I guess this was originally a safety feature, but is now enshrined as an anti-theft feature?
https://s3-us-west-1.amazonaws.com/h...yce_emblem.gif
Reminiscent of the Simpsons scene in which superintendent Chalmers's Honda emblem is stolen. 11-second video:
https://www.youtube.com/watch?v=7n8L07Q0iR0