Because I am a clumsy-ass dork, I recently dropped my Macbook from about a height of two feet while it was open. It didn't experience any loss of function or any major damage, but the lid so bent in such a way that now one edge is open a millimeter or two even when fully closed. This bugs me and also invites dust intrusion and further damage. Solution: a Big Damn Rubber Band, which clamps it down nicely. Stupid of me to have dropped it, but at least I'm smart enough to have an easy fix.