My dad does the first one in my car. I keep a grocery bag in the center console for trash, and whenever he's mucking about with the car (something he rarely informs me of before he does it) he throws the bag away and doesn't replace it. So not only do I have a drink cap or a candy bar wrapper or some other piece of potentially messy trash and no trash bag to put it in, I'm in a moving vehicle and it's not like I can go to another room and put it in that trash bag for now.