A few years ago I got myself lunch at a McDonalds drive-thru. It came with a “large” soda which was about a foot tall and seven inches in diameter. The very bottom of the cup was slightly smaller so that it would kind of fit into the cup holder. The parking lot ended in a small hill that went down to the street. As I came to a stop at the bottom of the hill the soda flipped out of the holder and tumbled end over end down onto the floor in front of the passenger seat. I reached down quickly to pick it up and was shocked to find that not a single drop had spilled. I think I would have been out of luck if I had put the straw in.