WHINY ANTISOCIAL LEONARD: Don't forget to put down a chair or something so you can save the spot.
PCL: I shall do no such thing. The practice has no foundation in law, and I believe it a hostile and selfish gesture.
WAL: Everyone else does it.
PCL: Then everyone else is hostile and selfish. That doesn't mean I have to be. Street parking, by its very nature, is public; if you can't save a spot when there's snow on the ground, how can you save a spot when there is?
WAL: Fine. Let's both of us have fun getting frostbite and having several small heart attacks shoveling snow for an hour, only to have someone else park there and take advantage of our hard work.
PCL: That is the nature of societal cooperation; there is always a chance that someone will take advantage of your hard work. But if everyone else did the same as me, I could park in another free spot and take advantage of someone else's. So everybody wins.
WAL: That only works if everyone cooperates. In practice, though, someone will take your spot, and everyone else will put out stuff to save their spots, and you'll be screwed.
PCL: That's...look, that's not the point.
WAL: What is the point? And why am I Whiny Antisocial Leonard? It seems to me like I'm the one being practical.
PCL: Shut up and keep shoveling.