Has anyone ever heard of this?

I have found no cause, but It seems to happen about once every 2 weeks.

I'll be driving along then all of the sudden it sounds like someone threw a brick at my driver's door. Other than this loud noise, no other problems occur.

Nope. Might be the window popping on and off the track, speakers shorting, etc. Bring it in. Doesn't sound like a problem that others have had to me.

Does it happen over harsh bumps. I have what sounds like metal on metal bang over harsh bumps and I am pretty sure it is the drivers side door. I have had nothing but trouble with that door. Bangs squeaks and rattles.

Nope, Just driving down a flat, even street and BOOM!
Its really weird.

I took it in yesterday but I doubt they will find anything... I'll let you know what happens.