I'm going to nominate a few of the other parents of a play participant. Last night, the twins had play practice until 8, and I went up to the school to get them. I had parked in a parking spot (they are marked and perpendicular to the area intended for driving). The lot has a clearly marked entrance and exit (signs that read "exit only" and "enter here". So there is one SS parent who feels that the fact that it isn't school hours means that they can drive in via the exit (nearly head on hitting people who are driving the correct way into the lot). The really aggravating one, though--this lot is not big, and there end up being quite a few cars (it's pretty near full), so I will nominate the parent who felt that getting there early (I followed them in, I got there about 15 minutes before practice was scheduled to end) meant that they could park crossways (i.e., same way that they had been traveling, just pulled over across the marked spots) to occupy three parking spots (plus no one would have felt ok about taking the spots next to him, so really 5 spots occupied by one vehicle).
I get it, truly I do--it's very annoying because the lot is small and there's just so many people there at the same time (and if there's a ball game still going on, I have been known to text the twins to let them know I'm on the street a block down just so I don't have to mess with it) ... but park correctly, and follow the traffic flow established by the signs. All those other cars in the lot? They should be evidence that your* child is not the only one who needs to be picked up after play practice, and following the rules just makes it a lot easier and safer for all of us.
*"your" meant for the other parents who aren't following the established parking lot rules