In 2011 I developed a spiteful and obstinate attitude to parking spaces. It all started because of this parking space neighbor I had who had a tendency of cutting corners when parking, leaving the corner of his car in my parking space. Not that big if a deal, but it was annoying having to accommodate his (presumed) desire to be able to get out of his parking space without a 123-point turn. So I stopped accommodating him.

I began to park in a manner that was really annoying for him, as long as I stayed between the white lines. It seems he took the hint, as he started parking properly after that.

This habit kind of stuck - when people can't park properly, I don't give two shits about making it difficult for them as long as I'm firmly between the lines.

Yesterday I went somewhere, and there weren't a whole lot of spaces available. But there was one where I managed to squeeze in with just enough room on my side to get out. On the other side someone had backed in to a parking spot leaving their front left wheel on my side of the white line.

When I came back to my car 15 minutes later (I was just picking something up), I saw a woman struggling to get into her car.

Her: "Did you really have to park so close??"
Me: "I parked well within the white lines, and it's not my problem if others have problems doing so"
I saw her starting to try and form a sentence, but my field of fucks is barren, so I just got in my car and drove off.

Childish? Yes
Petty? Yes
Satisfying? Absolutely

I consider it a public service, as it's a learning opportunity for people who don't understand the value of proper parking.

EDIT: Oh, and I told my GF this when I got home. She reminded me that this is a very small town and there's a non-zero chance that I could run into that person again. I should keep some crayons and one of those "color between the lines"-things in my glove compartment just in case I meet them and they bring it up. Not a single word as a reply. Just hand them the kit. It might take another 14 years but it will be so worth it.