First off, if you're a regular Jalopnik reader, this article isn't exactly for you. You know this. I've even been a jerk and made fun of folks who don't know this, because, again, I'm a jerk. But we've realized how many folks still don't know this, so we want to help. So we're starting JaloPSA, where we have simple, sharable tips for your car-ignorant friends.