My van isn't the worst, but it's pretty dirty with road warrior status. Long trips usually involve sunflower seeds that inevitably end up on the floor. If I'm feeling really froggy (and am in a large enough town), I'll pick up some cigars for the return trip. Then when I finally get home my mouth is ruined in two different ways, my van reeks and is covered in bugs, birds, and deer, and I feel like an absolute monster just stewing in my hot seat for hours on end.
OBC: I have a distinct memory of a family trip to the east coast and we stopped at a Taco Bell and even at 12 years old I was thinking, "this is the best Taco Bell I've ever had!!!" I think it has something to do with being a bit travel weary and a familiar comfort food hitting the right spot. For the record, I had the Road Kill Diner tonight, and even though it was just chopped steak with onions and mushrooms on top, it was pretty damned good.