On a more serious note, don't they just screw off on a manual.
And on a less than serious note, my wife once came home from a night-shift in the Accident and Emergency (where she was a nurse) in a very amused state - they had spent part of the shift removing a Mini gear knob from the girlfriend of the Mini's owner ... ... ... guess that puts a different slant on removing a gear knob, the Fire Brigade had already severed the connection from the car with a grinder - no, this was not a vehicle accident!