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So, you do three times as many checks, and you're concerned about someone else developing a habit, lol? FWIW, I do the same things. I never shut my truck door without physically verifying I have my keys (lesson learned). ;)

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Any time I am sitting in my car, my keys are in one of the following places:

* The ignition (my car plays a chime if I open the door with the keys still in the ignition) * My pocket (self explanatory) * My lap (they will fall and make a racket if I stand up without grabbing them first)

My father's system: Only lock doors from the outside, using a key. It's hard to lock yourself out that way. (Not helpful if you live in an apartment with doors that lock automatically.)

If you had an automatic key starter you’d never even need to take the keys out of your pocket. My new car has a keyless system and I never take the “key” out of my pocket. I just need to be nearby to click on a button on the door to open it. To lock, I put my hand in my pocket and click the lock button.

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