Just got my rMBP today, and so far the machine is great... except that when the laptop isn't on a desk, the case is very creaky. It's most noticable when the laptop is picked up from the lap, but you can hear it just from adjusting it on my lap. This is my first MacBook, but I have had experience using them and haven't heard of such an issue before, though I'm sure other people have had it as well. I'm simply wondering what my options are. I set up a Genius Bar appointment for tomorrow morning but I'd also rather not spend the gas money to drive to it (it's rather far). I would see if I could tighten the screws but I need a screwdriver with a special head to do so. Just want to deal with it now since it's brand new, rather than a year or so once it becomes a potentially bigger issue.