Mulholland Drive - directed by David Lynch, and starring the lovely Naomi Watts.
In the movie, Justin Theroux's character - a young Hollywood movie director named Adam Kesher - drives a silver base Boxster. He's got the car, the house, the wife, the cash, the whole Hollywood dream.... but ultimately no respect. Here's the scene where he drives home mid-day only to find his wife in bed with the pool boy (played by Billy Ray Cyrus - no joke)!
http://http://www.youtube.com/watch?v=h2w0_hl2rVQ