Well besides the Millenium Falcon and the Batmobile from Tim Burton's Batman films....the most realistic choice for me is a....
<a href="https://s258.photobucket.com/albums/hh277/Chigger58/?action=view¤t=PulseRifle.jpg" target="_blank"><img src="https://i258.photobucket.com/albums/hh277/Chigger58/PulseRifle.jpg" border="0" alt="Photobucket"></a>
One that has the sound chip and all the bells and whistles....that would make me happy!