No reason you can't have a .wav play that sounds like bay doors opening or plasma cannons charging.
Besides, if you're (or a passenger) in the car, you can't see external ordinance.
Something I always wanted to do was put a big honkin Red Button somewhere. When passenger asks "What's that?" you say in a panicy voice "Oh nothing, just never ever push it". So when they do, you make the sunroof open automatically, and the AssKicker mounted under the seat start rumblin. "I said DON'T PUSH THE EJECT BUTTON!!!".
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