a flat screwdriver can be used to lever the plug out usually.
It is a silly connector really.

I hate it when you help a stranger (who happens to be stunning) change the flat tyre (which you noticed in the firstplace and even left a notice on their windscreen) on their car, even using your own jack coz they don't have one and despite asking where the best place for a cheap meal is they don't get the hint and say they don't know and leave. [breath]
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-- Murray I What part of 'no' don't you understand? Is it the 'N', or the 'Zero'?