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How is it possible to lock the car without the keys? Maybe if you press the 'stick' down accidently?

Unless the kid press the 'lock doors button' by the driver seat.

I've accidentally dropped the key at the same time as slamming down the trunk. The key happened to fall into the groove that the trunk goes in, and the close button got pressed by the closing trunk. This was a fun one to explain to the AAA guy. I'm sure lots of other ways are possible too.

>I'm sure lots of other ways are possible too.

There actually aren't! Modern cars are surprisingly good at avoiding this. You can't even lock the doors while they are open. The trunk is the only opportunity for that accident.

Or you give the kid the key to hold for a while, strap him in the seat, close the door to go to the driver seat, kid presses the lock button and throws the key away. That was a horror scene while in holidays with another couple. Fortunately somebody arrived to help without having to break the glass.

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