The 'Genius' at that Maine Apple Store was absolutely intentional in his behavior. Initially he just returned from the back, plopped my machine on the table, told me I'm all set and quickly took off before I could even inspect the machine. When I found him again and showed him that the spacebar wasn't depressing at all anymore and wasn't registering keypresses, he took it to the back again, made it slightly better (by hastily ripping out the rubber dampening membrane out), I confronted him about it again, pointed out that the dampening membrane was missing, and he just said to me he doesn't see anything wrong. I was absolutely floored, I had never seen a person behave that way before at that point. And come to think of it, not even since then.