When changing my oil today, I had just the front end jacked up (usually I have both ends up because I tend to rotate tires when doing an oil change, but not this time). When I opened my passenger door to get my notebook from the glove box to log the mileage, I noticed that the door felt strange when opening and closing. Looking closely, it looks like the latch wasn't aligned quite perfectly, so it was rubbing a little on open and close. This happens on both doors (which admittedly are big, heavy coupe doors) but wasn't happening anymore after I let the car down. My guess is that the body is flexing a little in response to being jacked up on one end only. Seems a little chintzy. Is this normal on modern cars?