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 she'll go for days without locking it because the key is somewhere in the car. 
It is quite an anti-theft device.... 
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As a follow up on this, I noticed my co-worker getting into her jag...and, figuring all was well, asked: "So, did you have the key replaced?...or fixed...or something?"
  She replied, "No, I just don't lock it now!" But I do have a spare key!" 
Obviously, over-engineered, and not doing any "typical" owner, any good!  I lock old "Diesela" just to run into the quickie mart, and I'm not even afraid of losing all my coupons in the back seat! I guess I'm definitely old school.