Probably not the *most* passive aggressive thing I've done, but this comes to mind as it was only yesterday this happened.

So I'm driving into a parking lot to get my car headlight fixed. It's one of those stores where if the staff help you out in fixing something you'll need to make sure you're parked in their designated lot. This particular lot has a mere dozen spaces (city centre location for you!) It's a Saturday and its busy, but there's one space left.

This space is available, had the moron on the right not parked his shitty little run around over both his space and the empty one. This left just enough space for me to park but have to squeeze out of my side of the car, which I was fine with because there was no where else I could park legally.

So I swing my car into the space and switch of my engine. By this point my boyfriend in the passenger seats looking at me like, damn, that's cold, as the douchbag driver looks at me stupidly.

Turns out his very large girlfriend was stood behind both cars with her hands on her hips, proclaiming she "wouldn't be able to get in now!" So the driver gets out of his car and looks over to me (not saying anything though, this being Britain and all the consensus is that the best way to get what you want is to look pointedly at someone and not say anything at all) I just smile back at him sweetly and open my door to get out.

He just sits back in the seat, slams the door and reverses with a squeak of tires so he can let his girlfriend in the other side.

I honestly only wanted to park. But I managed to get him to leave without any hassle at the same time and that kind of outcome in this city and country is music :)

On another note, I have seen and been subject to many overweight drivers and passengers take up two car spaces or tap on my window because I haven't "left them enough room". Ain't like you got a bumper sticker noting your height and weight! All I'm saying is, we have disabled spots for that.