The only way i could see expecting that is if your car happened to be parked in the middle of a paintball field.

Assuming that the parking lot of most stores ISNT located in the middle of a paintball field.... What is so wrong about leaving the windows open? Don't you like the breeze? What if the air in the car was stuffy, after either being driven or parked in the sun all day? The last I remember, babies need to breathe and stuff...

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