1) If someone is giving yourself and others a ride somewhere in a two door car and drops the person in the back off first, get out of the car and move the seat forward so they can get out more easily.
In high school, I was the one in the back seat of a two door car. A friend gave myself and a guy I had a crush on a ride home after school, dropping me off first. Crush was in the front seat and didn't even bother getting out, just leaned forward and pulled the lever to bring the seat back as forward as it could go with him still sitting in it. It's hard enough to get out of the back seat of a 2 door, and I had a large backpack and a gym bag with me that I had to squeeze out with me.
I no longer had a crush on the guy after this incident.
2) (This one is for my dear husband) In the event your passenger(s) might be prone to motion sickness, for the love of all that is good and holy, if you are in traffic and the car in front of you moves up about 3 car lengths, it really is not necessary for you to hurry up and close the gap then slam on the breaks so that the car lurches forward. And if you are asked to stop doing this, do not blame it on the car in front of you. They are not the ones I'll want to slap when I'm trying not to vomit.